Hi - I thought it prudent to post (and I will on as many forums as possible) warning people to not use this service. I used Guy4Game to powerlevel my character, including reputation farm and within 24 hours of completing it had received an email from Blizzard indicating I had been using a bot or third party automation software. It took six days to get a response from this company and the best they could offer was a 40% discount on a powerlevelling servce, even though their website clear indicates a full refund and up to $200 per order (they can't replace the Collector's Editions that are no longer available).
I cannot believe they would compromise my account by using a Bot. Extremely poor customer service. Overall, very disappointing and upset with the experience.
If you are considering something like this, you need to also consider the worst case alternative - your account being banned.
Bottom Line: DO NOT USE GUY4GAME.