I initially shot a M&P9c and a M&P9 full size 4.25" S&W manufacturor reps guns. Who knows how many rounds they had on them, but the triggers were nice. I just sold my XDM9 to get the M&P9L. I got the 9L 5" and not the Pro since I am going to put in Apex parts into it anyways. Was thinking the Competition kit, but now that the new Forward Set Sear with the new trigger is coming out around May 16th or so I am considering that now. Don't know price difference though, need to do more reading.
Another reason I didn't get the Pro 5" was because you have to cover the target with the front sight; 'dead on' or 'cover up' hold. I eventually plan on trading out the front sight, but it's not a big deal to me right now, we'll see though.
I got mine new for just under $500 shipped, I noticed at Buds the 9L and Pro were the same price for some reason. If that held true and they had them in stock then I would of gotten the Pro for sure. I'm sure I could get used to the 'cover up' POI hold though, and the Pro looks cooler than just a 9L on the slide.