I bought the "dear" one (Norway Zip-Strip - don't know why the company is called Norway, maybe it has something to do with the exorbitant price...
). It works really well, but I still managed to gouge my carbons a bit. The fletchings were put on using a cyanoacrylate i.e. superglue, and in retrospect I should have been using shaft wraps.
Unfortuately I can't compare the Zip Strip to the cheaper one, but I'm sure it works fine too.