I've got several of the M&P 2.0s myself; a 40 compact and two 9mm compacts. None of my Shields are the new 2.0 models, but if I come across the right deal, I just might add one for the improved texture.
But if you really want to treat yourself to a huge upgrade, consider putting an Apex trigger in your M&P. I haven't done it yet (partly because it's hard to justify paying 50% of what I paid for the weapon for just a new trigger), but when I have handled an upgraded S&W/Apex weapon that my brother shoots... I've got to admit, it is just superb.
And if you don't feel like spending the whole $160ish bucks, on the Shield models, just replacing the disconnector is a huge improvement, for around $40.
Si vis pacem, para bellum.