Re: DSL vs TSL
I've got TSL60. Sitting on 1936 Cab. When I was hunting for an Amp I compared it to all the other Marshalls and this is one I liked best. The cleans are awesome, and when you dial the EQ in, it sounds just like marshall crunch should.
I was after an amp that could do Guns n Roses, pearl jam, ACDC, Led Zep Darkness, etc, and this amp does them. Its a great sounding amp and if your after a Marshall, I would say its as good as anything they are selling now. Only gripe is its too much amp for practicing at home, but when I get to turn it up playing with my band, its killer. And since we play covers the 3 channels makes it easier to vary the tone from song to song.
There were some differences between the DSL and TSL but I can't remember what they were. They weren't massive differences though. They shouldn't make you settle for a 2 channel amp if you prefer 3 channels.
Check out the marshall amp forum, i think they have dedicated pages to the DSL vs TSL debate.
Cheers and good luck