They're Mesas.
Saw one of these in a local shop recently - they're pretty sweet setups.
That said, I used to own something similar, a Mesa
Rocket-44 (my first Mesa, in fact). Kickass cleans and lead sounds, very Mark-like... But really wouldn't have been THAT much more portable than a Mark-V. I don't own it anymore, and they don't have info on line, but a 1x12 combo they bill as "lightweight" in the product description still weighed in as something like 50 pounds.
I just suspect that if you bought an Express, it'd just end up gathering dust.