Pros: No heatshrink, very nice braid quality, looks good, lots of colours available
Cons: price, doesn't fit natively onto your PSU
Once I got my hand on them, I couldn't help noticing the very good quality of the braid (which is also reflected in the price, I paid €8.9 for the 24-pin and £30 and a bit, shipping included, for the other ones). Something else I really like is that they have no heatshrink at all, which makes them look really slick in my opinion.
what I don't like (though I realise it's a bit hard to make cables that fit onto every modular PSU ever made) is that they are extensions and therefore require cables to be added to the case, making cable routing somewhat more challenging (though there is also a certain amount of fun in getting that perfect).
All in all though, I'm very happy with them, and I'll probably buy some more in the near future.