Sparrow is a fine can. I have one of them, along with a Spectre II, and three Pilot 2s.
Sparrow is one of the most versatile cans out there, which is why I bought it. However, being a mono-core design, it does have some FRP. It won't be the quietest first shot around, but subsequent shots will be better.
I also have a Spectre, that I use on another 17hmr. I haven't shot it enough it judge, but I will say that sucker is big and heavy.
My three Pilots are for my 22lr herd. I abosolutely love them for 22lr, as they're much lighter, shorter, cheaper (Pilots were $260 with a $200 AAC credit, when I got them), and as quiet or quieter (for 22lr) as the above two. But they will not do 17hmr.
As mentioned earlier, if I had it to do again, I'd likely have two Elements and three Pilots. But it's all good... Sparrow and Spectre are fine and versatile rimfire cans. I just feel they;re a bit to big and heavy for 22lr. YMMV.
BTW, I am not an AAC can fan-boy. I prefer Sakers on my rifles, and Octanes or Ospreys on my pistols. But AAC is doing something right with the Elements and Pilots, IMOHO, especially when they have the store credit promotions.
I just order the SilencerCo Sparrow .22 cal suppresser. It will suppress .22, 22 mag, 22 hornet, 17 hmr, 17 wsm, and 5.7mm.
I bought it because I heard it was the best rimfire can out there. How much truth there is to that I am not sure because I have not used it or any other can for that matter. I liked how easy it looked to clean and the different rimfires it could run.