I just put the original touring rear tire back on my recumbent after trying one of Continental's training slicks. I'm always looking for less rolling resistance. I thought that going from a 35mm clunker at 80psi to a 28mm light weight slick at 120psi would make a huge difference. I figured that I would have to ride the brakes going uphill to avoid speeding tickets. As it turns out, it was only barely faster, and after only 2 days, the sidewalls were already starting to prove their reputation for being fragile. It was on sale so I'm not crying about it. It'll make a good back-up tire.
I'm not saying not to try the tires. I'm just beginning to think that for a given bike, rider, terrain, etc., there's a point of diminishing returns in changing things. Those tires may well turn your bike into a screamer, but don't be disappointed if they don't.