I had 2 Shield 1.0's that I got when the prices were low and the rebate was available and really liked them but wasn't crazy about the gritty trigger. When I saw the Shield Plus at my LGS it just felt right in my hand. At the range I shoot the Plus significantly better than the original Shield but not as good as my Performance Center 2.0 4". That is the great thing about Smith and Wesson they give you options ( to the detriment of my credit card). If you are happy with the 1.0 or 2.0 great, if you want more rounds and better trigger (IMO) you have that now as well. The Shield Plus has replaced my Glock 43 and 43X as my EDC.
Happy shooting,
WK