Tracy,
You might get more response on the DJ Forum as that is really the target market for such products with rental and staging as a secondary market.
In regards to LCD display versus projection on a spandex screen, almost regardless of the projector used the LCD will provide a brighter, sharper image. At the same time, it would take an array of several tiles LCD displays to provide the same image area as one of the stretch screens, say something like a 2x2 array of 50" flat panel displays for the typical Odyssey screens. LCDs also require no throw distance or space for the projector, avoid concerns about interference with the projection path and avoid hot spotting that can be common with stretched spandex screens. It probably comes down to how much the video is a focus for the audience versus being an effect.