I AM a big fan of the shuttle ( you might have already guessed that), but I feel I can still express negatives about it. I know some people on this board talk like a commerical and there is never ANY hint of possible negatives of the amp. That alway trips the alarm bells for me.
Here's what I dont like:
1. The push button filters have so far proved useless to me. The only one I'd have use for, the low boost, I find just increasing the bass eq sounds better.
2. In order to get 'my' favourite tone, I have to EQ it significantly which eats up headroom, which means, overall, its not as loud as say... the LMII (even though the LMII is rated 100w less).
3. I dont like the grindy tube character you get when you play louder. I know thats not really a fault of the amp, some see it as a feature, but I like clean tone.
4. I wish the on/off switch was on the front. Get rid of those filters to make room for it!
My .02 for what its worth.
That said (here come the pom-poms) I love this freakin' amp! Its super light, has tons of useful features and most importantly the EQ'd tone I DO get is simply heartstoppingly beautiful.
If thats too much cheerleading for you, just read above a few sentences, starting with number one etc.