I don't know where you are in Oxon, but if you are passing you can borrow my rollers to try (I'm in Barton).
I still want to learn to ride on them without falling off, so would want them back at some point, but there's no prospect of me riding them in the next few months.
I got them because I thought it would be an interesting change from the turbo and I could put the recumbent trike on them. I set them up in a doorway and I can just about ride them, bouncing my shoulder off the door frame every so often to steady myself, however I can't do a workout there, and riding them in the garage would result in me falling off onto various hard/pointy things. They do work with the trike, but the resistance is low without anything on the front roller, so I end up in top gear, and the gears aren't suited to precise intervals.