I happened to be at GC and they had an LMII for $475. So being curious (not unhappy with the Shuttle)--but yet hearing several folks claim that the LMII is louder than the Shuttle; I decided to pick up an LMII for a loudness comparison. I had an LMII awhile back before the Shuttle and remember that I didn't like the amount of headroom I felt I got running at 8-ohm through a single cab. I recorded my bass playing into a wav file so I could have a consistent signal into both amps (eliminating at least one variable). I EQ'ed the signal on both amps to as close as possible the same (but I know that's a tall order with just my ears so I won't claim the EQ was exact). I ran both through my 2 12" cabs and used a decibal meter from about 3-4 feet away. I made sure both preamps were running entirely clean (by my ears). Then I brought up the volume levels to the point where I could just start to hear distortion of equal amounts on both amps (audible to my ears). I should note however that the distortion on the Shuttle at that point sounds like tube grind whereas the LMII sounds like SS distortion. The numbers (C-weighting) were Shuttle 117.5db, and LMII 116db. I also have to say I could get the Shuttle a little louder still if I wanted more grind (which wasn't objectionable) but I could not do that with the LMII---overdriving it further made me worry for my speakers. as an aside--I also ran the NEO-Pak and got a number of 114.5. However, if I wanted to run a little more grind--I could also get it up to the level very close to the LMII (and still without any distortion that sounded worse than a tube-amp type of grinding distortion. Sometimes on a gig, I like to really dig-in---I really don't feel the LMII would give me a decent safety margin while the Shuttle would not make me worry as much. I feel I could keep the Shuttle at a higher level and at worst when I dig in I'd get some grind. I feel the LMII would make me want to back off more. Realize that you could add a limiter or compressor to the LMII and possibly improve the situation. Personally I don't see how anyone can make the claim that the LMII is louder than the Shuttle. And that's whether or not distortion is taken into account. Perhaps into different speakers that are a better match for the LMII? I don't know. What I do know is I convinced myself after having some doubt and being totally prepared to make a switch. However, I'll keep the Shuttle for the reasons given. (the extra features and better warranty/repair options on the Genz stuff is a big extra for me as well) Next was my decision on keeping the NEO-Pak over the LMII as a backup. While the LMII is slightly louder than the NEO-pak---I still think it's the fact I can run the Neo-pak dirtier and make up the difference. And when I really dig-in--it seems like I still feel more comfortable (less worried) doing it with the NEO-pak--even given the lesser power. I'd probably be more inclined to use both cabs though. My goal isn't to start a big argument here---ymmv---different speakers, eq points, playing styles can all come into play. PS--one other difference too was that it seems that the volume knob on the LMII gets to a certain point and doesn't get louder--seems to somehow increase alot on the first half and not as much on the back half of it's travel. Could imagine that having the volume come on so quickly in the lower part of it's travel could contribute to a perception that it's louder than it really is.