Paul,
I do love these BEL's. I also have Joule VZN100 OTL's if I have the hankerin' for tubes on the Ronins. This is the second time I have owned the BEL and they are staying. Right now I actually have a MK II and a MK III, as I was thinking about getting a third for a run at the Orions (on hold). They are on the upgrade queue for MK V's, which takes months. I don't like to rave about the BEL's too much and you'll notice most owners do not, mainly because they are scarce enough and nobody wants to create too much buzz on them. I first heard them as mono's on Vandy 5A's and was shocked at the time at how good it sounded. Then we tried a pair of MG3.6's which are notoriously power hungry too, with great results. Elegantly simple design, yeoman parts, but a magic transformer of some sort that makes it all work. I have no idea why they sound so much better as mono's, but they indeed do exactly that.
Tom