The Elite Fluid utilizes a fluid resistance unit with the company's Elastogel 45mm diameter roller in their CRONO frame. They tout it as the smoothest, quietest and easiest to use trainer ever built. So I put it to the test. The preliminary impression of the unit is that it is light weight and well constructed. It is also easy to carry and the unit folds fairly flat for easy stowage under a bed or in a closet. This, combined with the advertised quietness of the Elastogel resistance roller and progressive fluid resistance, could make this trainer a good choice for someone that lives in an upper level apartment that doesn't want to bother the lower level neighbors. The setup was also fairly straight forward. You lift the arms in place and you place the bike between the arms and tighten the adjusting knob. But be sure to read the instructions, conveniently located on the arm adjacent to the adjusting knob, on how to properly secure the bike to the trainer. The adjusting knob is nice and large making it simple to hold the bike with one hand while tightening or loosening the bike on the trainer with the other hand. In new condition https://www.bicyclehero.com/us/elite-crono-primo-fluid-elasto-gel-cycling-trainer.html https://www.roadbikereview.com/reviews/elite-fluid-primo-trainer-pro-review $185.00 OBO