Back in "the day" when Rem. came out with the 5mm rimfire I thought it was a cool cartridge and wanted to get one. I remember talking to a trapper who figured it was a big improvement over a .22 rim fire or a .22 mag. It was his idea of a perfect beaver cartridge.
The .17 HMR never really got me too excited though I have talked to some who were really impressed by it.
The .17 hornet got my attention as is is reloadable.
I just watched a review on the new .17 winchester super mag. and the Savage rifle they have built for it. I just may have to get one.