After waiting patiently for a second S410 cab, and finding out that it was never shipped, then learning that there was no more left (can you feel the heat?) I had a GS 212 delivered at a huge discount. I don't know what the 2x410's would have sounded like, but I have no regrets after a short session with the stack today. I hooked up my Kustom Groove 1200, going into the 2 ohm load for the full power output. No cranking today, but all I can say is that I've forgotten what a big rig is capable of. I had to drop the lower EQ as the 212 adds a massive amout of lows on it's own. I cut 1 horn to see if there was anything weird going on phase-wise, but I did not detect anything. It's very nice how these 2 cabs stack, and the nice part is that they are great together, or separate. My prior cabs were the Avatar 212 and 210 which sounded nice, but I really didn't know what I was missing. I will eventually hook up my B4r to examine the tonal differences, but not right away. I may post a detailed review after spending some time with the rig.