Appreciate the perspectives here. I picked up an Omnium last fall when I had my knee replaced. Allowed me to have an easy-to-mount stable trainer in the garage, vs using my SportCrafters rollers w/Overdrive and Inertia drums and a modded InsideRide Floating Fork Stand (FFS – not sure they thought about the acronym…) that fits on my SportCrafters rails. That setup is on a floating platform in my basement. I avoided navigating stairs, and the gyrations to mount the bike on the rollers – even with the fork mount.
Since then I’ve landed on the rollers sans fork stand for most workouts, and the Omnium for those times I don’t want to have to think about stability and handling the bike.
FWIW at age 67 unlikely I’ll ever see and FTP above 300, so unlikely I’ll outperform the resistance available. Yes, the Omnium does have less inertia, but that’s not a big issue for me.