To be fair, the problem for me was lack of a good holster, as there were only a couple available for the gun at the time I had mine. I would hope the holster makers have since learned of the problem and addressed it. If the holster protects the mag release, it shouldnt be an issue.
The P7s are great pistols and mine was the most accurate pistol I've ever owned or used. The only downside is, you pretty much have to dedicate yourself to the platform to carry it, due to its manual of arms.
Price these days, like most anything HK, is way out of line too. I only paid $450 for mine new and spare mags were $25 at the time. I sold mine a few years later for $975 and mags were going for $125 then.