Steve is referring to me (he now owns my JC-1s). In a smaller room and with summer temperatures, they can become a little unbearable especially since there are two of them dispensing heat. They do sound exceptional with a tube preamp (Aesthetix Calypso for me as well), but this only adds to the heat generation. Thus, you must have excellent air flow, blast the air conditioning, or have a really large room where the heat can quickly disperse.
But if you CAN accomodate, you will be GREATLY pleased.
The bass control of these is absolutely amazing and something I haven't been able to find in any other amplifier. The way the amp controls the woofer with piston like precision adds new depth and realism to the presentation.
In my dream system, I'd have these amps. If I had the (dedicated) ROOM for my dream system, that is. :)