I have not used the official Inside Ride E-Motion rollers, but built a DIY setup that mimics them:
I have been using the E-Flex for a few weeks, and now with some mods. Here is my rather long review (with a short summary at the start).
Super short summary, I love them both, but I see the E-Flex as the best option as a single, do-it-all choice between the two.
- This assumes you already have a Kickr and are mainly looking to add some freedom of motion without the associated extra level of difficulty that comes with rollers.