Can't wait to hear some personal reviews on the amp!
The separate reverb footswitch logic, I'll take a shot at it. I have owned and loved many Boogies (currently have 3 Marks and a Recto) and I kinda get where they are coming from.
I postulate that the separate reverb footswitch is keeping it simple and reliable.
--There is a reverb level knob on each channel, and most players tend to set and forget their reverb. Since you can dial it in that much better than a global level for both channels, having a reverb footswitch is made even more unnecessary, for most.
--Having the front panel channel switch jack right under the input and the reverbs, EQ, boosts, etc... via the back panel/chassis jacks is part of the old school, Mark based way. You add what footswitches you need, a la carte. If you just need to channel switch, a simple, solid single button switch is there. This is also the pre Mark IV way, where their footswitches were not modular anymore.
--Those Boogie footswitches are solid and reliable. If you have any issues, it's easy to get parts or a cable and keep on. 1/4" jacks on the amp, no resistance switching, just solid open/close mechanical switching. Having just simple open jacks on the amp side is also proven as the long haul winner vs multi pin, DIN, etc... for jacks and plugs.
Thanks for responding to my question. The only Mesa I own is an original Express 5:50 and, as you probably know, it came equipped with a single three-switch footswitch for selecting channels, and for turning the reverb and the contour EQ off and on. Your reasoning for excluding the option on the Fillmore (and other Mesas) makes sense — certainly not a deal breaker. In my case, there's not an urgent need to switch the reverb off and on as I seldom adjust it after the initial setup at a venue...again, just curious.Many, like myself, just dial in a little reverb and leave it on all the time when using it. If you do that you don't need the switch so the main footswitch can be smaller and less expensive.
I've found that in many halls, particularly larger ones, there's enough natural reverberation that reverb isn't necessary, so in that situation I clearly wouldn't need the switch either.