After lots of experimenting, I've had a pair of Fender/Eminence V1030 speakers in my Vibrolux Reverb clone for some time now. They really capture the crisp blackface voice that I love. But for a long time I've been wondering about the Celestion 10-inch Greenback. So I ordered one. I installed it today. It's definitely darker (warmer?) than the V1030. I'm not sure I would be happy with a pair of them. But so far, one of each sounds pretty good. I'll give the Greenback time to break in and take it out to some jams before I make a final evaluation. My goal is to tame the brightness of the amp a little bit. Eminence Allessandro 10s might do that, too! That's another one I'd like to try. It's a lot like the V1030, but has a different, softer dustcap, which probably tames the highs.