They're definitely not something I have on display like the amps - more a dirty little secret. But in truth, they work better than anything else I've tried. The mods make a huge difference too, raising the bar to a high level of quality. Can't tell it from looking at them though.
Remember that you posted the link to the little daughterboards? I ended up buying a bunch of those and retrofitting a couple crossovers with them. I still have the first one I did with the point-to-point perfboard modules, but I had to give the daughterboards a try. It's handy to have a couple of them anayway, so you can run a pair of flanking subs at a fairly high low-pass frequency and have the option of running another pair of subs further away at a lower low-pass. Besides, the cost of entry is real low.