I dont like the idea. Sooo much drivetrain friction. I'd rather the extra roller. At least I'd be going a little bit faster with a little less effort. Plus, dirty chains and legs, that dont matter to me. I'd still lube my chain every 2nd ride anyway, even with a tube. My opinion is that recumbent manufactures use these as a cost saving measure, plus, in reality, they do the job they're intended to, just not as well as a 2nd roller. Chain Tubes are ****!