Got my first can in about a month ago, the Pac lite & Ruger a week ago, and just yesterday got a chance to shoot it.
Looks like I've got a new addiction. Later this summer I'll probably start papers on a 9mm or 45acp can.
I'm leaning towards 9mm due to round cost, but 9mm subsonic isn't as common as .45acp subsonic and I'd need to buy a 9mm host gun, whereas if I went .45, I'd just have to get a threaded barrel for my 1911.
I've heard of people shooting 9mm with their .45acp rated can, but I'd be curious about the noise report.