I have tried both Nokon and Gore Ride On. Nokon are a bit fiddly to fit and not actually fully sealed. Also, the "bling" finish starts to wear off very quickly. Performance has been good so far tho’, but according to Nokon they do still need lubing.
Gore are fully sealed (provided you get the sealed version!) and pretty easy to fit, although I did have to drill out the cable stops to run a full length of outer. They don’t need any lubing at all though, so get my "fit and forget" vote. I shopped around and got the long fully sealed version for £30.