I've eaten here as a change of pace from Panthere Verte (next door). Where PV is like a cantine, Crudessence is fine dining. The food truly is amazingly well-prepared and fresh and wonderful (there's also a hot menu if you're not totally down with raw, but really, do try the raw). The only downside is the very steep price tag that comes attached (I once had a $25 lunch here)... Which is probably why you won't see me here too often, except the occasional dinner, but the price does reflect the ingredients in this case.
You gotta try this place even just once.