Would absolutely recommend the Big Twin, collected mine a couple of months ago after using 2 BC212 with the TC BH500 head for 5 years.
I can absolutely say that it's transformed my sound, I would struggle to get good top end from the TC cabs and now I have no issue. I play in a LOUD rock band and even though it's one cab, I can hear myself no problem without monitoring, even with our drummer, and he hits hard.
Alex is a great guy, when I first spoke to him there was an issue with cost (what I could afford at the time from the BF range would have been inadequate for my needs) and he then gave me advice on how I could improve my sound with the equipment I had. Top bloke.
Also, I can't believe how lightweight the cab is, a real bonus when you have a shoulder problem like myself!