While I've found cloth-sheathed releases to be, generally, a bit smoother and more supple than either plastic/metal or metal-only sheathed releases, I've also found that many brands of cloth-sheathed releases simply don't last - and that in fact they tend to suddenly fail (in the field) with no warning. But I've been very stubborn about insisting on cloth-covered releases, and so over the years have spent a small fortune...more or less continually replacing them.
So when I recently set about to research this a bit further...I discovered that many folks, who'd had similar issues with their releases, are very happy with Pentax cloth-sheathed releases, citing not only their quality and smoothness, but also their longevity. So... I went ahead and replaced all of my old releases with new, Pentax ones (20" long, from B+H) - and am (thus far) a happy camper!
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