I had a Shield 1.0 and currently own a Shield Plus.
I got the 1.0 in 9mm due to all its rave reviews. I wanted to like it but ended up not liking it at all. Thought it was uncomfortable. Also, after having owned a few M&Ps and others, I've come to accept that I hate hinged triggers.
I came across a 'can't lose' deal on a Plus, so I bought it. I didn't expect to like it, given my prior experience w/ the 1.0, and because I also have a P365 that I'm very happy with.
The Plus is a winner. The trigger is probably the best they've ever put on an M&P. There might be Performance Center variant I don't know about, but you're not spending 2-3X the cost of a base model to get an improved trigger either.
The grip texture is a happy medium between 1.0 & 2.0. The increased grip thickness for the higher capacity mags also makes it much more comfortable to shoot.
The mags are expensive at close to $40 street price, so that Bug Out Bundle w/ the three extra mags is a good deal. It was only a few months ago that a base Shield Plus w/ two mags ran $500-550.