I've got one of the original Tacx Turbos. Never had a problem fitting any bike into it - geared/fixed/700c/27" - well, no problem other than having to use the supplied QR skewer in place of hub specific ones that is. As I'm lazy and swapping between turbo and road depending on the weather, I'm also using the Tacx QR when I'm out on the road.
While sorting through stuff in my parent's garage the other day I looked up and spotted my old Olmo monoroller (think that was the name of it) wedged between a rafter and the roof. Thought I'd got rid of it when under BB cable routing became the norm. Any body remember them?