Love these tubes! Yes. You can feel the difference. Just a nicer feel than butyl tubes. And they have less rolling resistance. They loose air pressure more quickly, but they are NOT more delicate or more puncture prone than standard butyl tubes.
Boy these are heavy tubes. But after three consecutive days of flatting from different punctures on new tires, I gave up. Once installed, your wheels will noticeably slump around and handling is pretty terrible. But hey, no flats after 600 miles so far, a couple self-healed punctures, and they hold air like a dream. I'd never use them for training or weekend rides, but they serve their purpose for daily commuting peace of mind.