Feedback Sports Omnium trainer for sale. Features a progressive internal magnetic resistance so the faster you spin the higher the resistance. Really smooth and quiet. Years ago I trained on full rollers, which are kinda fun but you can't really lose focus. This trainer is a great compromise where your front fork is fixed and stable but your rear wheel can still feel the rollers and drift a bit side-to-side particularly if you're putting down more power.
Packs up quickly and super compact; it's great to take to an event for a pre-ride warmup. The fork mount is adjustable and comes with a variety of adapters for QR, Thru-axle, etc. Can fit a BMX, roadie, 650, MTB... The sled is also adjustable for a wide range of wheelbase lengths.
I'm first owner, used for around a year and a half before I upgraded to a smart trainer. Bought new from REI for $525.