I just spent an hour demo-ing the 35. I tried two combos, one with C90, one with V30. I tried them individually, plus with a V30 Thiele in parallel, then with just the Thiele, then with a recto vertical 2x12.
That amp just smokes! It is a lot like the V:25, as you might expect. But it definitely has... more. More low thump, which I struggled with on the 25. It also seems to be more mid-forward, like the V:90. In that sense, I like the 25 more, as it has a better tone balance I think.
I liked the V30 combo more than the C90 combo. I liked the Thiele by itself and with the V30 combo, and I liked the recto cab.
I liked the extra headroom on the clean channel. I wound up using clean instead of fat, which I didn't like in the 25.
It was quite easy to set up having owned the 25. It has the same conundrum: wish crunch was a third channel.
Anyway, I think the combo could actually be a grab&go, unlike the Rectoverb25 combo IMO. Adding the Thiele really cemented the giggability.
It won't seriously challenge my RA100 for tone or versatility, but the 35 is a great amp and is a heck of a lot smaller and lighter. If I HAD to go small, I think I could go with the 35 combo and be happy.
Down side: Not as much low thump as I would like, a bit too crispy in the mids. Kind of like an F50, actually.
It is a lot like the 25, but really a beast all its own.
I probably would not use the boost.