They are neat guns, not very practical for concealed carry but the resurgence of them from the trade in deal starting back in '07? We saw them take back off again. The main drawback is magazine supply.
They carry nice in a good holster. The short barrel makes them butt heavy when holstered.
On the range they can heat up pretty fast due to the gas system.
Carry wise you're looking at a heavy vs capacity piece and the Euro-style mag release is goofy for some.
I had a couple and sold them, they are nice guns so if you're looking for a conversation piece or range toy they are great. Collector appeal varies, prior to them being reintroduced to the US market they were more scarce.
There are other variants of the P7 that are more collectible.