Unless you already have one and don't want to shell out another $500+ for essentially the same pistol.Calling it some "enhanced" seems odd when what it enhances really doesn't have a purpose going forward? There is no world where the regular Shield needs to exist now.
Will the trigger enhancement make that much difference in how someone shoots the Shield? Probably not much.
Are the extra rounds worth the cost? Personal decision, but you can modify existing mags and add a couple of rounds to the current Shield.
A different grip texture? I've never had a problem with my Shield 1.0 grip texture. SW got too aggressive on the 2.0 grips for a lot of people carrying concealed IWB and backed off from that in the new Plus version.
Why did SW offer the 2.0? They saw the success of higher-round subcompacts from other manufacturers and wanted their slice of the pie. And, they wanted to offer a new model so owners of previous versions would dump the "old" model in favor of a younger model.
I've watched several videos on YouTube and a couple of reviewers have said the grip isn't much thicker than the old Shields or that they feel about the same. I haven't seen any calipers put on it and SW doesn't list the thickness of the grips. There may not be a lot of difference in the thickness of the grips but the thin grips of the "old" Shields has been a marketing point for SW.
Will I buy one? Maybe down the road a bit. I'm in a "pause" right now from buying guns and I've Beta-tested a couple of guns in the past and will let someone else do that for me now (I wouldn't expect a problem, but who knows).