I was in the same boat as you for a while... I had a Triple recto 3 ch head and needed a combo to lug around instead of a head/cab rig. I got a Rectoverb and loved it, alot!! But, it didn't have the balls I was used to hearing coming form my head/cab setup. The Rectoverb combo sounded better through my cabinet than my head did to, but that kind of defeats the purpose of a combo - doesn't it? So I sold it and got a Tremoverb combo and it just came in today, but I already like it better!
The T-verb is voiced after the older dual rectos, and to me it sounds warmer than my triple and r-verb did, but just as brutal. I no longer have the Triple either, I found a T-verb head to trade for and so now I have 2 T-verbs....... So you know what I'm going to say! But my head runs 6L6's and the combo runs EL34's and @ 50wts with some tubes pulled.
The only thing the T-verb cant do that the duals/triples and Rectoverbs can do is the Solo boost......But there are work arounds to that if you really need that.
As for direct recording, the Slave out will sound terrible! Thats more for running into another amp or a power amp. If you want to do direct recording, try a Line 6 or Vox Tonelab or even a Behringer V-amp.... All were made for that, but the VOX sounds best IMO (got a Tonelab SE too). The VOX Tonelab has a GREAT recto model!! Not to mention all the other tones.