I've got a Banish 22 I've had for a bit. Primary use it on a heavy barrelled 10/22, which is notably more accurate than my other .22s. Great for groundhog control in a "civilized" neighborhood that frowns on firearm discharges. Never had a complaint. Significantly quieter than a high powered air rifle I have when using standard subsonic CCI minimags. Also good for hearing-protection-free target plinking both with the 10/22 and a Mark IV 22/45 pistol. The light weight of the unit is one of its best features. I just clean it periodically by disassembling and throwing it in an ultrasonic parts cleaner.
My experience with Silencer Central was o.k. A few years back, the wait time on the ATF permit for a trust permit was forever. It may have even been over a year as I recall. Can't really blame SC for that. But, I am also recalling that SC lobbied hard to keep the ATF permit requirement, even as the tax was being eliminated to protect their business model of "assisting with the permit process". So, I doubt I reward them with any future business.
The legal history of the legality of ATF permit process was that it wasn't a violation of the 2A, because the permit was a tax (per SCOTUS many years ago). Without there being any tax aspect remaining, the entire permitting process is unconstitutional by the reasoning of that case. Not sure when or if the current permit process will be challenged in the courts going forward. Would have been far simpler for congress to simply eliminate it. SC helped keep that from happening is my recollection. SO F them.