About 1,500 rds through my MP45c purchased new in mid-Feb this year. My first polymer gun, and a plastic gun was about the last thing on my list of stuff to buy. But, I put 100 rds through it on rent at the club and bought it the next day.
So far, it seems to handle a wide range of loads with just the stock spring, and I'm at least as accurate with it shooting freestyle as I am with my full-size Sig P220. The stock trigger was god-awful but with about 90 minutes worth of work you can make a huge improvement. Drop in a $30 sear from Apex Tactical instead, and all you might want to do is tidy up the trigger bar loop (the part that engages the sear) and maybe round off the firing pin block pin, and hey, you've got what I think is the ideal carry.
I plan to shoot it in CDP division at the local IDPA match this weekend if my holster comes. I'm not saying "I trust it so much I'm willing to shoot a match with it", I'm saying it will definitely not be a negative impact on my score and I want to see how she handles under a little light pressure.