So, I finally got the Twin Jet up and running. Tubes weren't matched, but that will be fixed. For my brief impressions, I can say that the Twin Jet is WAY tighter than the Rev Blue, especially unboosted. I also find it to be more articulate and with better note separation for leads. I don't know what the hooplah is about with the allegations that you can't get clean tones off of Channel One. It's just not true! They aren't Fender sparkly, but they are about as good as the ones off the Rev Blue IMO. The amp overall has a darker tonality, and there seems to be an emphasis on the lower mids that's somehow different from the Rev Blue, which sounded brighter in the upper mids to me. This one has the clean channel mod, and I find it to be a much more exciting and versatile amp already than the Rev Blue. Channel One really can get a myriad of tones out of it, anything from decently clean to JCM 800 sounds. For some reason, this thing doesn't sound as hissy or with as much high-frequency fizz running through the Uberkab- another definite plus.
Overall, once I get this tube issue settled I'm sure it'll be a beast. It seems that the Twin Jet's second channel was made for more intricate and faster metal riffs and leads than the Rev Blue's was, which always gave me a more hard rock vibe. It could be the KT88's or the added controls in the master section, but in either case, it suits my needs a lot more. It's already becoming the amp I tried to make the Rev Blue for about a year with pedals, tube swaps, and hours of dialing in, but failed. I'm definitely glad I swapped them out.