Hi all, thanks for the answers.
I do take my video job seriously. For years I've used regular topside tripods (Gitzo) and ball heads underwater. Caring them underwater its not a problem (although I admit that some times a lift bag will be very handy..)
But now, after 15 years of use uw, my Gitzo head (ball head) needs to be replaced. I have disassembled it many times to clean it, and thats why I wonder if that will be possible with a fluid video head and, if not, how long will it last.
Many times I've used them in situations where a small / dedicated uw tripod will not work due to its limited size/high. In some very limited situations I've used a monopod, but most of the time, I need a tripod so a head is a must.
TLC tilt/shift head looks good but I'm not sure about the smoothness of the movement. And i don't need the legs. But, anyway, I will look more carefully at this option, especially because of it's corruption free constrution.
ULCS looks too small for the kind of gear I need to put on it (DSLR housing + external monitor + arms and two lights).