My wife and I definitely enjoyed Le Lab, although being used to the Chicago mixology scene we weren't really expecting the banging house music or fusillade of flaming shots coming to all the tables around us. Those things weren't negatives though, it was actually a really fun atmosphere!
The most important part of a cocktail bar is the drinks, and Le Lab has those down perfectly. We made our way through four cocktails that were conceptually interesting and VERY tasty - my favorite was an absinthe drink that tasted like a mild Orange Dreamsicle.
The only thing that was a slight negative was that the waitstaff was stretched a bit thin. To their credit, they were flying around the bar, but with another server or two around we would've ordered a few more drinks and stumbled home instead of walking. :)