I happened upon this thread again - it's like one of those old school car mag "long term test drive" type reviews My Red Sub is still rumbling along - mostly nicely. It has developed a small fault - there's something iffy about the headphone jack which causes it to short occasionally, hence having the effect of muting the amp as if a plug had been inserted. Easy fix, plug something in it then remove it and it clears the problem (I always have a 1/4" > 3.5mm converter in the aux input so something suitable is always to hand). It only happens once in a blue moon so I haven't got around to looking into it. I guess the socket needs replaced which shouldn't be too troublesome.
It has been used at least once a week at "war volume", mostly in the combo at rehearsals where it is the only bass producing equipment in the entire room and makes itself heard over the top of drums, keys, vocals, trombone and sax. In March that'll be 4 years I've had it and it keeps on doing exactly what I need. I will be sad if it ever does give up the ghost - to me this amp does everything I need and it'll be a right bugger to replace as I don't think there's anything quite like it around at the moment - not that I've been seriously looking.