I believe that the TSL is a great amp, I had one that I bought back in 2000, and stayed with me 5 years, loved the 3 channels, I just sold it this week.
For some guys the clean channel it's no so clean, and if you try to use it with pedals, it won't be transparent, it will be always sound like Marshally :-) , but for me that's obvious, so what the hell.
I used more the Crunch channel, since it gives more Satch like sounds, but let me tell you, the Lead channel it's also very good, loved the sound with Jackson guitars.
But again as I grew musically, my taste changed a little, and since I've always loved Stach's music, I'm changing my amp to JSX, I just got it today, still testing it.
So far I love the way it sound with Les Pauls and my JS
guitars, the clean channel it's a lot better, the crunch channel it's really good as well as the Lead channel.
Don't get me wrong, I will never sound like Satriani or Vai, I try to play Satch, Vai, Gary Moore, SRV, classic rock, blues, and I like what I hear. I still get the TSL kind of sound, plus a lot more, I felt a little restricted with the TSL lately, but still it's a good amp.