OP, you will not be disappointed. I've owned a Kommando, cobra, Phoenix, brs99, SAF, etc and this is the best feeling/handling smg. Trigger isn't great though but the feel and the fact Wolverine keeps spare parts and mags on hand is great.
Copy that. My TP9 in ODG is a favorite, and with the Aimpoint it's quite deadly even out to 100m no issue on an IPSC gong and very rapid acquisition at 30-50m. With the folding stock you have an added measure of accuracy/ confidence you may not get from a regular handheld 9mm pistol - the stock although 'somewhat' short but not VZ61 short, allows rapid consistent head shots on paper at 40-50m - for that added level of excitement that I almost never get with handheld 9mm at that distance. Also I don't have any extra accessories for my TP9, but you can get a drop leg holster, brass catchers, suppressors etc and spare parts seem readily available for now. I also like the little side rail for a flashlight or laser whatever. Also the ability to field strip in mere seconds is definitely a bonus for cleaning.
CONS - Yes, the trigger is the trigger but it's not a Match rifle, some people say it feels lifeless or whatever, I don't know. I have no issues - Probably my biggest complaint is the bolt lock release, it's kind of awkward and not the easiest thing to disengage, it's just this kind of flat metal tab that's neither a button or a switch, it takes some getting used to. Other minor complaint is the lack of ability to 'Pop drop the mags, you basically have to manually pull them out once released. Also the Irons are pretty much for show. But as far as operations go (in nearly 2 years) I've never had any failure to eject or failure to feed that I can remember, but when you seat the mag, you gotta make sure it seats, it will fool you sometimes.
I believe the TP9 was originally designed for under the jacket VIP style protection or motorcade security assist use and CQB? And no doubt loaded with some 147gr XTP's it packs a serious punch. Yes it was expensive at a time when the reviews weren't all that stellar, but again it's more than just a 9mm - probably one of the closest to a CZ Scorpion style SBR you can get in Canada.
I'm sure for those that want an Angstad 9mm style AR you can go that route too, but the B&T is pretty unique.