No. This is not a good refection of your business. You should not have to 'bribe' your clients for a review. I would suggest a more creative solution and build it into your marketing plan, e.g. ask clients, up front, if they would be willing to provide testimonials for your projects so they know it is part of the process and provide a written survey that you can then turn into a rating with a comment section that can be turned into a testimonial you can use anywhere.