Great amps! I have a DSL 100. It was modified by Voodoo before I got it, however - so can’t speak to stock tones.
But all my research before I bought it several months ago was that they sound great and have a lot of flexible options. Two channels, crunch toggle on the clean side, added gain toggle on the dirty side, and a good effects loop.
The reverb won’t get you near Fender territory but nobody buys a Marshall for that anyway. I like it more than the reverb on my 900.
The one risk is that early models could have bias drift issues. I think that was resolved in 2005, so I’d say check the serial for production year and potentially proceed with caution from there. Mine is a 2009.
They’re sleepers price wise; often in the same ballpark or less than the 900 Dual Reverbs. I would pick my DSL over my DR any day of the week.
Lots of great info on The Marshall Forum. That’s where I did a lot of my research.