One of the best cycling trips I've done, and I've done quite a few!
There was lush scenery, a lovely group of like-minded people to be spending time with, fun guides who've done it many times before and vast quantities of food usually supplemented by the local homemade chacha and wine.
The riding is great: some moderately challenging climbs (but perfectly doable for anyone with a reasonable level of fitness) and the descents are just sublime - in particular the 8km rocky, hairpinned descent to Vardzia and the 20km+ descent from Goderdzi (mostly gravel but in the process of being tarmac'd) both had me grinning like a loon all the way down.
Although the trip is rated 'challenging', I found it easier than the 'Cycle the backroads of Morocco' trip, which is rated as 'moderate'.
Yes the accommodation is a bit short of Western hotel standards at times but it's all perfectly fine, adds character (particularly the homestay on day 5) and is all part of the adventure. It's best if you just go with the flow and don't mind sharing a room.
There are a lot more swimming opportunities than advertised - definitely take advantage of the chance to try out the ramshackle hot sulphur bath in Vardzia before jumping into the cold river right next to it. Also the green lake on the Goderdzi pass day and the waterfall pool on day 6.
Agree with one of the earlier reviews that the final night felt a bit flat compared to what went before - Batumi isn't the nicest of places to end the trip.
Most of our group stayed on at least one extra night in Tbilisi and the team were happy to drop them off at their hotels in town rather than at the airport, where the trip is officially supposed to end.