I had no trouble hiding its length or height; it was the outside rear corner of the slide that bulged/printed. I actually wished for more length, so that when holstered, it would be more stable. I also wished it balanced more toward the barrel, than the grip area. The P7 is indeed a mechanical marvel, getting that much barrel into such a compact frame. But, it is compact in the dimension that, to me, does not need to be compact. I like 5" 1911 pistols, and carried them on duty later, and also for CC on my own time.
For a 1980's German police officer, the P7 was a great step forward. When I had to use a flap duty holster, it was good for me, too. (Not sure if West German police used flap holsters then.) When my agency went with a better duty rig for sixguns, I considered the modern rig with a sixgun better than an autopistol in a slow 19th-Century holster.
Had it not been a financial necessity to sell them, I might still have my P7s, but I would still likely be using the P229s I am using now, which fit me better, balance better, and handle better, for me. Others prefer different fit, balance, and handling, andf that is great. FWIW, back in the 1980's, SIGs were quite the sensation themselves, with their frame-mounted decocking system and precision engineering/manufacturing. SIG and HK were both big prestige pistols back then.