I'm not the OP, but I did just get a new TS100 on Friday so I thought I'd spend a couple minutes sharing my thoughts, comparing it to my existing ART SLA2.
I'm at work so I'll keep this brief-ish for now.
To preface, I am a standard-tuning "metal guy". I play through a Genz Benz G-Flex 2x12 in stereo. Most of my patches tend toward the very high gain end of the spectrum. Several of my primary patches began their lives as Mark Day's patches that I tweaked slightly, primarily EQ.
Things I've noticed so far:
1. When I turn on the TS100, it makes a surprisingly loud "bonk" sound right behind the power button. I called Carvin and they say it's normal for this unit, that it's the power going to the transformer.
2. The TS100 has a very quiet fan
3. I tend to prefer the tones I'm getting when amp sims are turned ON
4. The TS100 is A LOT brighter -- more highs, more presence -- than the SLA2. I'm having to back WAY off the treble and presence, not just in my existing patches but even for default amp sims. And that's with the presence on the TS100 turned all the way down.
5. The TS100 sounds much fuller, clearer, more "hi-fi" than the SLA2. This has the logical (but unanticipated by me) consequence of making patches with reverbs and delays sounds much bigger and better.
6. The TS100 amplifies somewhat different low frequencies than the SLA2, which has required some Advanced Amp tweaking in order to pull out a little bit of "flub" from my patches but the overall fullness is improved.
7. With my Axe, I have previously tried: Obviously the SLA2, a new Velocity 300, a Recto 2:100, and a Boogie 20/20. They all have their strengths and weaknesses and I think I prefer the TS100 overall. It makes a couple of my favorite patches sound absolutely ridiculous. Too much gain and too punchy for a band situation, but so much fun for in-the-bedroom/studio playing. (I could easily tone down the patches if I needed to but I don't need to!)
That's all for now. I'll post again after I've spent more time with the TS100. As of this moment, I'm planning to keep it. My only concern is the treble. I'll need to spend more time on that to ensure it isn't going to cause too much listening fatigue.