If I had to guess, Its because its probably the best competition model pistol HK ever made. Plus it had the Funnel system(9&40) for hi cap mags and comes stock with an ambi control lever. Throw in a competition trigger and your all set. I don't personally own one yet. The HK shooting team currently uses the P30L now. But there are very recent vids on YOUTUBE of Jason Koon using a Expert 9mm again. Plus visually I think itis a lot more appealing to most folks than the USP Elite. But that's just my opinion, like I said I don't have one yet!