A friend, who is a serious guitar collector, has a Lonestar Special. I've played a few things through it, including his mid-70s Les Paul Custom and Eric Johnson Sig Strat, and it sounds absolutely glorious. Very easy to dial in good sounds too (I have no other experience with Mesas, but have read they can be a little tricky to EQ).
On the drive channel, with the blues setting on and neck pickup on the Strat selected - instant Eric Johnson tone. Select the bridge and you've got instant SRV.
If I only ever played blues, country and light rock, I'd be saving up for one. As it is, I need something which can do hard rock/metal too, and good as it is, that really isn't the Lonestar's forte. It's a stunning amp though.
Prices - I'm with Dave on this one - Mesas seem to cost the same in dollars as they do in pounds, which, given the exchange rate is 2 to 1 at the moment, is crazy pricing.
Despite this, I'm still GASsing for a Mesa Roadster head.