just wondering what the reliability of the Marshall DSL 100 JCM2000 is.

And if it did need to be repaired, would it be easy to fix, by a repairman?
Tube amps are very simple to fix. So if it did, you shouldn't have a problem.

Marshalls tend to break a fair bit, but I would think the newer ones are fine.
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Reliability on those is pretty good. I wouldn't suggest mismatching the impedance with your cab since marshalls seem to really like blowing output transformers.

As far as fixing them goes, they are PCB, so they are a bit of a pain in the ass to fix unless it's a simple tube or input jack issue. On the other hand, you're probably not in the market for anything handwired, so it's kind of a non-issue.
..depends on why it needs to be repaired. My band's rhythm player uses a dsl 50, and we've toured a ton with it, as far as i know, it holds up,

Gibson Les Paul Studio w/dirtyfingers pickups
Gibson Joan Jett Melody Maker
VOX ac30 head
Marshall 1960 4x12 cab
Fender Hot Rod Deville