Looks like there are at least 3 on the market. Do they perform better than a normal 22 can like the Spectre II? Reading reviews of the Ruger Silent SR ISB weren't that positive. MIST-22? Skip it altogether?
There is nothing cooler than assembling the TD with the integral suppressor and firing off the first few rounds. It always draws attention. I have a Mist TD and love it. I think it is quieter than a Spectre or most screw on cans. It was way more volume. I compared it to a TD with a threaded barrel with a SPectre, a Mask, ISIS 2 and there was one other. To my ear, the Mist won out.
The advantage to the other cans is you can use them with multiple hosts.