I've been using the Westcomb Fuse, roughly the women's version of the Shift, since March. (Thank goodness for sample sales--I never would have looked at it had it been full price!) I say "roughly" because a few of the features are different; it has two hand pockets instead of one napoleon pocket. I really like having the handwarmer pockets; they get a lot of use.
This is the lightest weight NeoShell I've used (Rab's new offering, the Myriad, looks comparable and with a significantly lower price point), and it's pretty great stuff. Whereas jackets like the Rab Neo Stretch are definitely geared more toward winter and mountain endeavors, Westcomb is producing a versatile all-around, all-season shell. Granted, I haven't been through a hot humid summer with this yet, but for temps between 0 and 15 Celsius, in either sudden cloudbursts or all-day mist and drizzle, it has performed incredibly. I also find that bringing a windshirt along with the NeoShell is redundant because the breathability is good enough(I am sure sweatier people will disagree with me) that I am happy to walk in this jacket with a pack on while warming up in the morning or getting over windy stretches. I haven't done enough side-by-side field testing to really say whether NeoShell is *more* breathable than eVent, but I do find it somewhat more comfortable than eVent due to the element of stretch--the fabric moves with you much the way a softshell does
I really appreciate Westcomb's design principles and build quality (they are one of the few outdoor clothing manufacturers that has figured out how to make women's clothes that actually FIT). For the record, I also really like Rab, and their NeoShell designs are also very impressive (if buying full-price, I would probably have gone with the Myriad). NeoShell interests me because it blurs the line between softshell and hardshell and pushes the boundaries of what each can do. It's pretty cool stuff, and I'm usually a "don't believe the hype" type of person.