ARONOV LS-9100 ..How realible is this tube amp ?

I've had the Aronov LS-9601 integrated for about 5 years now and been very happy. Never had a single issue; the thing is a workhorse, puts out plenty of power with tube warmth, a full bottom and lots of detail. I threw some Golden Lion KT88's and 12AX7's in there to replace the Aronov stock tubes (which were fine as is) and it upped the sound a bit. I'm running them with a Benchmark DAC, Oppo BDP 93 and B+W Matrix 3 Series 2 speakers. I'm upgrading the speakers with Vandersteen 3A's this week, and looking forward to hearing them in the system. I haven't heard the Threshold 4000 so have no input for you there.

Pescolar, frankly the reason I have the integrated vs the monoblocks is simply because I found the integrated at a bargain price...If I had had the option for the monoblocks, I would have sprung for those, and opted for more flexibility in my system with preamps and so forth (not that I am unhappy with the Aronov preamp, just curious as to how a different preamp would change things). I did see a set of the Aronov monoblocks on audiogon a year or two ago, but don't recall the asking price...but I remember wishing I had need and $ for a second system!
Bodotes, I believe Aronov is back in business, but there's no website. here's the latest:
http://www.theaudiobeat.com/equipment/aronov_la200.htm

No complaints here, I got my older version amp for under a grand (new model is $5,000), because no one knew what they were looking at in the shop...for better worse, on a musician's wage, I'm a budget audiophile