Hey Finnster,
So, I have an Express 5:50 (1x12) and the other player in our band has an LSC (1x12)! How do they compare? I think they compare very favorably! When I was testing the Express, I played a Lonestar back-to-back with it (and others) and to my ears I didn't think the Lonestar was appreciably better (not the extra $$ better anyhow).
The Express 5:50 clean mode is excellent, and the reason that I got the amp! I play with humbuckers only (LP Standard and ES 333), and the sound is just beautiful - exactly what I was looking for! The Lonestar clean I feel is slightly better, but only slightly and to my ears it sounds a little too "nice". The Express seems to have a little more "attitude". Perhaps that is a function of the smaller cabinet?
Also, the fact that the Express has the footswitchable reverb is a big plus. BTW, the reverb on the Express is sweet! The Lonestar is renowned for its reverb, but I think the Express reverb sounds equally good. It doesn't have the reverb bright/dark control (or whatever its called), but that's trivial to me. The fact that the footswitch controls it makes up for that!
How are the gain sounds on the Express? To me they sound great! The crunch mode on channel 1 is a thick, harmonically rich tone that I wish you could clone for channel two (or was footswitchable). On channel 2, I use the Blues mode exclusively, and it has just enough added "bite" to cut through a mix. The Burn mode is the classic liquid Boogie-lead, which is certainly inspiring and sounds great too, but is not really my cup of tea.
The footswitchable contour control is nice, but I usually just leave the contour on as it is the icing on the cake of tone!
The 5 watt mode also sounds really nice, and allows for lower volume break-up.
For me, the amp is perfect. I have been playing for 30 years, and it absolutely represents my playing the way that I want it to. It is extremley responsive to dynamics, and it just oozes tone. I know that has been said before of other Boogies, but for the Express and for me with my axes it is true!
Finally, I use a Seymour Duncan Twin Tube Classic with my Express, and let me say that using the rhythm channel on that with the Clean mode of the Express is just the best in crunch and classic rock power! Sweet!
Good luck in your quest, and whatever you decide it will be the right choice for you!
Cheers!
Richt