Following along with what Ratt was saying. I think you will find that Marshall sold a boatload of DSL amps (TSL as well). In fact, if Marshall were to release sales info, I wouldn't be surprised if the DSL was one of their top-sellers.
I posted something a long time ago. If you make X amount of product, you will have Y amount of failure. This is just basic common business logic. No one makes a product (especially a complicated one) where every unit is perfect. When you are dealing with an electronic product, there are always going to be some bad eggs.
Ratt is correct. 99 per cent of the people who post about their DSL needs help with an issue. Rarely does anyone post that their DSL is the love of their lives. It gives a false impression that the DSL is prone to all sorts of failures. That's too bad, because the DSL doesn't deserve that sort of reputation. It's as reliable as any other guitar amp.
I think the DSL is owed an apology.
Marty