Its been awhile since I sold mine, but I found it to be a a very accurate and easy pistol to shoot. You do need to put all others out of your mind when you shoot and carry it, and I dont think it would be a good on/off pistol. You need to either carry it or dont.
Mine had a very good single action trigger pull, it want musshy at all. When you say mushy, I think HK rifles.
The squeeze cocker, while slightly heavy to initially "cock", requires no weight or strength to hold it cocked. I could easily hold it cocked with just my thumb and pinky finger once cocked. Once I was used to shooting it, I never had it come uncocked unintentionally. The squeeze cocker does make the P7 one of the fastest guns to reload and get back into action. You can dump the mag easily with the trigger finger, that giant hole in the butt of the grip(P7M13) is hard to miss with a mag thats single stack at the top. Once seated all you need to do is close your grip and the guns ready again.
Safety isnt an issue if you follow basic safety procedures. Finger off the trigger till your sights are on and your fine. No different than a Glock.
It does get hot when shot fast and alot. Hot to the point of being uncomfortable, but thats just not a mag or two.
The sights on it are some of the best I've used. I like a lot of light around the front sight, and the P7 has a nice wide rear notch. Makes for a fast sight picture.
I always used jacketed bullets, be they factory or reloads. I never loaded 9mm with lead due to leading problems caused by fast moving bullets and lead. I've been hearing of a lot of problems with Glocks and polygonal rifling, (dont know if its the cause or not) so I dont know if it would be good to use lead if the gas system and leading wasnt an issue. You do need to keep it clean, but then again, you need to keep them all clean.
As for price, I wouldnt buy one for what they sell them today. They are not worth that. Then again, I wouldnt spend that much for any pistol, I dont see the need. When I bought mine, HK was still customer friendly, and the prices on all their guns was within reason. I paid $450 for it new around 84-85. I also paid $450 for my HK94($350 more and it was a MP5
) and a little over $550 for my 91. Soon afterwards, HK went out of their minds, became dealer only, and you had to be a special HK approved dealer, and they wouldnt even talk to you on the phone if you werent, they'd hang up on you. They started to cater to the police and government sales and their prices jumped by a lot. I sold my P7 because it became worth to much to carry.(and a holster mag issue) I bought two Glocks for what I sold my HK for. (should have kept the HK for a safe queen, the Glocks were a mistake, but thats another story).
All in all, if the price were reasonable, I might get another. I wouldnt carry it as I like the 1911's best for a carry gun. The problem's I had with the mag always falling out in the truck would, I'm sure, not be a problem with a good Kydex holster that is available today. They only had two available when I got mine, and both were not very good.