Re: A/DA Vintage Splitstack
I think they offered them with different speakers, so there's no telling what's in there. Although they're probably Celestions, I couldn't tell you which ones. When you say "vintage 2x12's" do you mean they have Vintage 30's in them?
My only recollection of them is that they were a little thin and mushy, but that was over 15 years ago, and we were all trying to get different tones back then vs. today. It might be time to rediscover them. Worst case scenario is you can probably sell the Celestions for good money and have some nice cabs. The vertical 2X12 sounded good to me with a V30 on top and EV on the bottom. Some knockoff cabs came that way back then, and I liked those. I've got J.F. Naylors (vintage Jensen style) in my 2x12 and I love it. But I usually use it side-by-side, and it's larger than those ADA's.
For portability, I always loved using a pair of Mesa's 1x12's. Those really kicked. Even their vertical 2x12 is wider and "thumpier" sounding. But you can't beat $250 for the pair of ADA's. It's virtually a no-lose deal for you. You'll profit or at least get your money back if you don't like them.