In reply to Lurking Dave:
I’ve got both the Definition and the Balance jacket.
The Definition is very waterproof. It’s kept me warm and dry during some pretty gross Scottish Weather. The pockets aren’t perfect for winter climbing.
It seems as breathable as any other three layer waterproof I’ve used.
I’ve had two Balance jackets. The first was only waterproof in a notional sense, even when new. It also wasn’t very tough. The second (current version) which has an burlier face fabric is a big improvement. It is tougher and much more waterproof. I really rate this jacket as it is incredibly versatile. It is light enough to stuff in your pack on an alpine rock route, waterproof enough to keep you dry in a prolonged downpour, and touch enough that it doesn’t fall apart the first time you climb wearing it.
Tom
(Full disclaimer: Alpkit supply me with gear to wear, but I’ve been honest with my assessments of these jackets.)