I have the £125 Edinburgh cycles (Revolution) version. The bag hasn't got taped seams so budget for some drybags if you want to go out in the wet. Mine has a plastic lever at the main pivot, on the ebay auction it shows a metal one which is good as I broke mine after some over-zealous strapping of cargo.
We went on a two day trip with some friends, we had two Revolution trailers and a bob between us, we did some swapping of trailers as there was another trailer purchase planned and we weren't sure whether the Bob was worth the extra.
I think the general feedback was the Bob is lighter, but the Revolution had a less fiddly connection to the bike (think the Bob uses some sort of pin which can get lost) is cheaper, folds flat into its own bag, but is a bit more rattly and a bit heavier.
The folding flat feature is a godsend as its a bulky bit of kit.