Bought my first gun, a S&W M&P FS9 in Nov '14. I then purchased a VP9 in '15, and a Walther PPS M2. I recently traded the M&P and Walther in on a P30SK and could not be happier with 'one' platform (HK).
I now have one mag type that interchanges, one set of mag pouches, one ammo type for training and carry, and one mag release type to deal with. Both guns are fully ambi, helpful for me (lefty) and my wife (righty).
I only wish I would not have put HDs on the VP9, so that I'd have the same sights on both (the glow in the dark OEMs).
Knock on wood, at this point I don't see any handgun purchases in my future, allowing me to focus on some much needed training the next few years.
I wish I had known all this ^^^ in 2014.