I recently learned about the new Jan's new Compass tires, and I bought the 700x38c Barlow Pass version, with the extra-light sidewalls. Only had a chance to ride them once so far, but it felt like an improvement over my old 700x40c Schwalbe Marathon Duremes. They felt like they would "spin-up" from a dead stop a lot faster, which makes sense since I think the weight savings is about 100g per tire; much less rotating mass. At full speed they were fine, didn't get any flats, even when I rode right through a pile of broken glass shards (couldn't avoid it). I ran them at 60 psi on my Velocity Synergy rims, and this lower PSI probably helped with avoiding punctures (I used to run the Duremes at 70-80 psi). Gotta get more riding time with them, but so far I'm a fan. The all-black look of the tires is sweet too.
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