Chairguy,
I have two ES1sl's and neither of them ran hot. Just lukewarm. Was it because you were driving the Maggies with them? Were they hot with the Vandies? Perhaps the fan was faulty?
I have to agree the build on the ES1sl is quite cheapish. Great sound for the money, though. It sounded good enough to displace my pricier gear for a while, but when I switched back I clearly prefered the tweaked out reference rig (ES1sl sounded musical and tubey, but always had the slightest bit of a homogenous quality). But I wasn't using any power conditioning on the ES1sl, so who knows? Again, great value and good enough to keep most non-gearhead folks satisfied, I think.
I find it ineresting that everyone was so into these good sounding units, then after the next generation after the F10 came around, everyone seemed to have moved onto something totally different. I was hard pressed to find any sort of review of the latter generations, just a few posts reporting that they were somewhat ureliable. Was the sound quality not sufficiently improved/different to warrant the interest? Perhaps they didn't represent as good of a value so people weren't interested? I've always been curious.
Best,
KT