Has anyone partnered with Grubhub, Doordash, or Ubereats? Do you recommend them? Has it worked well for you?

Yes all the above and it is great advertising. You may need to mark up your prices a bit because they take a percentage 

You have mentioned the name of three ordering/delivery service providers. There are others such as Postmate and Order On THe Way etc... People call them , place an order from the menu of participating restaurant. They pick up and deliver  and get a commission.
This concept is good for any restaurant  who mainly relies on take out. and does not have its own delivery drivers. It saves on cars and insurance. It increases sales . 
The cons: the commission. Each restaurant has a margin  of profit depending on cost and revenue., The commission will reduce this margin by at least 20%.
1- Do you need delivery services ?
2- Do your math and decide if it is worth it giving up the commission that is hefty.
3-If yes, compare  various providers and choose.  
At our restaurant , we do use a delivery service , other than the ones you mentioned. However we turn it off during our peak busy dinner service. 

We have had great success with UberEats.  Been with them for about 2-3 years.  Grubhub and Eat 24 were supposed to have merged, but I have not heard anything lately.  Way to many iPads to mange! We are on both Geub Hub and Eat 24 but only for pick up.  I am not with DoorDash have heard not so great things. We get a few orders here and there but doordash calls us directly and the drivers pay at pick up.

Buddy's Pizza and Steak deals with all three.  Using this service for our business helps us to service a wider market as our drivers are limited to the immediate geographical area.  As these services are prepaid, our accounting is more streamlined as we get a check each week for orders processed (no cash), and a list of orders placed which helps our business tracking.

So far the only one we have worked with is Doordash. It works ok within limits. For example they download your menu from your website, if it is correct your fine, if not there are problems. We have had problems with them ordering for customers. Example customer orders a hamburger through the app. If they do not specifically state on the order they only want mustard and ketchup on their burger, the driver or person calling in the order just states burger, the customer may call you back to complain. You have to advise them to call whichever company they ordered through, because you can only prepare what was ordered. These companies do not know your company or any restaurant in general, they haven't been trained nor been involved with preparing a meal so they don't know exactly what questions to ask a customer when placing an order. It reminds me of the old game, I whisper something in your ear, you whisper it to the person behind you, on and on till it gets to the end of the line. At the end the story is completely different.

You must be very diligent when dealing with outside companies, they do not have as much to lose, as their reputation is not on the line, yours is. I dictate the terms with these companies, it is my way or the highway as far as my business is concerned.

All business is not always good business, you can work with these companies, but make sure it is on your terms. 

Cavalier Diner has partnered with Grub Hub for almost 10 years now. While it is very annoying how that keep raising the fees restaurants are required to pay, it has provided us good exposure and an additional outlet for customers to indulge in our great menu. Payments are quick, no complaints there, but Grubhub has become quite a racket with their increasing rates on both restaurants and consumers. We’ve been forced to raise prices for delivery and not offer certain menu items to try to make up for what Grubhub charges us. 

Yes all three and Postmates.   Ubereats is the most expensive, but produces the highest orders and the fastest pick up times.  Consider it a marketing tool,  you can reach many customers that otherwise wouldn't have know about your place.  Many of our customers find us on a delivery app and then drop in and dine in or pick up without the app, they say they didn't know we were so close to their workplace. 

I have done the math, and with the modest profit margin we keep at the end of a sale it is not a good fit for us.  I have really wanted it to work, but when an establishment is running food cost, labor cost & overhead costs and netting just 10%, the 30% they keep would make our orders process at a loss.  Likewise, I did research on their customer satisfaction and have heard from multiple vendors, what others have said, drivers show up when no order was received, drivers are late to pick up, drivers get lost and food is delivered late....We have decided to wait and see what other services might become available down the road, or we will not be in the delivery business.

All the home delivery services are great for your current take out business. Beware though that your competitors are their customers. Good for advertisement appearing along with others giving potential sales to another location. Digitally delivery services will only take away from your in house sales.

I currently don't use any of them. I am considering a new delivery service thats going to be new to the area starting in April. Its called Waitr. The thing I like about Waitr is they come in take professional photos of your complete menu post the photos on their app so your customers can see exactly what they are ordering.They do charge the business 15% of the delivery order.They also do more to promote the businesses they serve. Stay tuned we will know more once they go live in April. .