I'd recommend it! The reviews would have to be very good though (2-3 Pages). If you have a promotion or a tech forum its a good service to put up. Compared to other services, its not much work :great:
I would like this service however some Reviewers could take this to their advantage and start trying to blabber on sometimes should they get bored or tired of doing reviews. Could be good to pay for a great service.
Reviews are easy to write up. A good, in-depth, 1-2 page (A4) review should take not more than half an hour to an hour, so its really something that could get you some revenue.
Though, you have to look at it in the view of a guest, and have good English, very important.
I'd pay for a review, if I trusted the reviewer to provide me with some valuable tips and ideas for improvement, that I could not come up with myself. People who pay for reviews also expect to get a lot of publicity in return for their review.