2.0 is nothing really special compared to the original...really, the difference is minimal. I prefer the first version between the 2. The beavertail and slide serrations on 1.0 are better, the trigger is not much different, a $30 Apex sear in the 1.0 is a big improvement if you feel the need.
If you want a good deal, Dante's has this one on sale for $477...sell one of the barrels and you are well under $400 for the gun.
https://www.dantesports.com/en/shop/smith-wesson-mp45-threaded-barrel-kit/
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