Mike do you have the floor standing Janszens or the monitors? I demo-ed the larger ones and think that they are very uniquely designed and very beautifully constructed; and they sound very clear and natural. Dave Janszen is a nice guy and puts out a good product. He seems to be going in the powered speaker direction these days, which is sensible from a marketing POV. I was close to getting those at one point, but decided not to make a change from one big tower to a slightly smaller tower since I have arthritis and am putting together a retirement system, and don't want to have to hire two hulking high school lads with a dolly and bungee cords to be able to move my speakers around when I need to do so. I have a suspicion from what I have read that Janszen electrostats sound a lot like Salks in their clear, natural, and "open window to the music" presentation. Yet, I have demurred for an infuriatingly long time, (like you I find it very hard to think about buying something this important without actually being able to hear them) but I suspect that if I could hear the Salk Silks I seem to be obsessed with, I would jump for the chance to get them.
It's tough being a "doubting Thomas" isn't it?