I was not all that enthused about the Glock single stack 9mm. I thought the 380 version was a better concealed carry option.
I finally got a Glock 19 a couple months ago and started carrying it. IMO, many of these single stack 9mm pistols are slimmer than the 19, but not significantly smaller or much lighter. I don't want to give up 15+1 capacity for just a little bit of width reduction.
What cordex mentioned about the price is relevant. With the Shield pricing and rebates lately, there is no reason to buy the others unless you just really want them.