Good choice. I've regretted selling mine since I let it go. Excited to pick up one of the new ones without thumb safety. I should be all set to pick it up after my next paycheck on the 15th.
I've owned just about every popular handgun on the market today and I've really come back to the M&P with Apex trigger parts. To me, it's the best trigger available on a striker fired gun. I prefer it to the PPQ(sold) and VP9(tried, didn't buy).
I still like Glock well enough. The Gen4 G21 w/ 15rd mag & TLR 1 HL is my nightstand gun, but my preferred carry is the M&P 45 midsize.
The Shield will be an excellent addition for those times when I can't carry a full size gun.