I've just upgraded our current (still in development) project to v2.6.
Everything is working right without any issue
I'm also checking out some new features (derived table and Designer.SyncRenamedFieldElementsAfterRefresh).
I've asked for these feature in the past, and I'm really happy that they are now there
I can't stop thinking (and spreading) that LLBLGen Pro, with it's fantastic customer support service, is a very BIG value for it's price.