I thought you had an L-580? In any case, I have no experience with the L-100, but I bought my L-580 new and it's the best solid-state amp I have ever owned. It has a special sound, different (and better) than my L-450 or L-480, although I like those also.
Bought the ones after the new L-580 a number of years ago when people still thought Luxman was second-rate. I kind of still wish they did, those were the days.