I was looking for a cheapish backup amp, with enough power to do larger venues without PA support, and the LH500 more than fits the bill.
Simple EQ (bass/mid/treble) gets a pleasing tone very quickly.
This amp is clean - you won't get any valve "grind" from it - but if you're looking for a lovely clean, warm, fat sound then the 12AX7 tube preamp certainly delivers. Matched with a 500W output stage, this is one very loud beast.
This isn't a lightweight, but the build quality seems very good. Given it's price, this must be one of the best bass head bargains out there at the moment.