I think you're both talking about the same round. It is a Rem 22 subsonic. A few dollars for a box of 100 at Walmart or Bass Proshop. It fires about 1020 FPS, vs 1080 for standard. So it is about the same speed, but just under. A regular 22 falls under the sound barrier after just a few milliseconds. It is super sonic just long enough to get the crack. Competitive shooters use subsonic because the shock wave during transonic flight screws up accuracy, and the reduced bullet drop from the slightly faster round is worthless.
The Remington round is also a few grains lighter. 38 vs 40 I believe. They use less powder. The round is noticeably quieter than a pellet gun when used with a sound suppressor, (at least so I'm told). The predominate sound being the bullet impact. Though I have no first hand experience, obviously.
I have used these rounds for sub MOA accuracy out of a relitivly inexpensive gun with good optics. I have a target I've kept with a one hole, 30 yard 10 shot group with this round. Good stuff IMO.