At twice the price, I have no idea what the appeal of HK is over other German plastic guns and the Glocks... aside from being a favorite of the tacticool crowd.
Yup that's the only reason I own mine, to be tacticool. It's funny you say that, as usually the guy next to me at the range with a Glock has just about every aftermarket part you can order (and the obligatory punisher symbol)
Different guns for different people. I like HKs because I like DA/SA guns and prefer polymer for carry. I've tried Beretta options and FNh options but the size of some of the HKs is preferable for me for carry. I try not to rag on any group of gun owners (that first paragraph is called sarcasm). I always encourage others to do the same. We all share the same hobby.