Got my Shift last week, thanks to D-town Disc Golf having them in stock still. I had the original Shift awhile ago so I had a pretty good idea of what I was in for. The improvements are asthetically minimal but functionally leaps and bounds above the first version. I only carry 10-12 discs and some miscellaneous gear. The Shift has more than enough for my needs. Add in that it is lightweight and comfortable, and you have a very attractive bag. Right now it's holding:
Jade
Witness
River
Felon
Trident
Fugitive
Truth
Harp
Opto Judge
Soft Judge
Proxy (My only non-trilogy right now, but only because it's new and I wanted to try one out.)
2 towels
EMS rainfly
Disc retriever
Maxpedition pack (keeps my pencils, sharpies, scorecards, manual)
And I still have room in the middle for extra water if it's hot, or a light hoodie if I need to layer. With the side pockets still for my wallet, keys, phone, etc.