I think most of your questions are answered on the site. For those that aren't a quick e-mail would probably be best. That said ...
One of the bad things about Wavelength products is their cost. The Cosecant is $3,500, and is one of their cheapest items. I'd love to try this myself, but not at that price.
It seems to work with Windows, and Apple based systems. It doesn't appear to work with an I-Pod however, if I read correctly.
I have no idea about your last two questions. I've seen no review on this, but it could have potential. Although I've seen other professional computer solutions discussed other places, that are likely more cost efficient. I seem to remember the Cain & Cain/ Electronluv display in Vegas using some $4,000 laptop based solution for a very well regarded presentation. They were talking about bringing that to market sometime soon. Since it included the storage and output solution in one package, it sounds more cost effecient. Tuberoller would likely know more about this however.