I'm with Shader. Someone using the Strike Rifle and the Stealth upgrade together could give an opponent with the Phase Rifle a lot of trouble. Even without stealth, it's by no means an instant win for the PR. I'm willing to bet a charge shot to the head is still an instant kill, and someone sniping with the Phase Rifle isn't going to be able to move around too quickly while aiming. It's going to be a matter of who's faster on the draw, and who can maximize their weapon's advantages.