My wife and I use one of these for quick accessible workouts.
Having to maintain tracking and form really adds to the workout and is a huge benefit over standard rear wheel trainers.
Its quick to layout and can be stored away easily.
The overall quality is less than I'd hoped but functions fine. No issues with stability or the issue mentioned below of the hinge falling out. Provided caps seem to do the trick. (If you lose a hinge cap, a rubber band wrapped tightly on the end would probably work fine, it just needs to keep the end from falling through the frame no weight should be born by retainer cap). I would think threaded ends with washers and lock nuts would make this over all seem a little better designed but there could be some reason for the push on cap design.
Still makes a good bit of noise, even more with resistance unit engaged, though for us we don't really need to engage it, just shift for resistance adjustment.
Good roller size for avid recreational riders. Seems to be endless resistance to be had within my normal gearing range without need to engage the resistance unit.
The Kreitler fork stand is a nice add, once in a while, if you want a thoughtless workout or to stand on pedals.
Since there's no variation in the roller you will feel your rides more in your "seat". It can lead to early fatigue since shifting contact points or standing off the saddle to relieve is challenging.
Rollers have held up just fine to our use and still do the job without any bearing issues.
It can be more difficult to do all out/HII workouts since it becomes much harder to maintain stability as you get to your limits, this could lead to falling or failure to maintain target intensity.