FYI, there was an entire thread on the Shield 1.0 vs 2.0 that you might find informative.
The changes were a slight improvement in the trigger, serrations on the front of the slide and a more aggressive texture on the grip.
The 2.0 version is about $100 more than the 1.0.
The main issue discussed was a lot of people thought the 2.0 grip texture was to aggressive on the hands and for IWB carry without a shirt between the grip and your skin.
The trigger pull and smoothness was a 50/50 tossup. Some said it smoothed out after a lot of shooting, some had no problem with it as is and others just hated it (for around $99 you can get a trigger kit).
If you can handle both I defiantly would to check out trigger and grip.
Personally I owned the 1.0. It came with 3 mags & night sights.
Be SAFE and Shoot Often!