Yes they are comfortable, first ride or two feels a little weird for a start but it soon feels like the norm. It all depends if you like low bars or not. These clip-ons are still mounted above the top yoke so we are not talking real low racing crotch rocket scenario here!
You cant mount clip-ons below the top yoke on the 300R as they would foul fairing. The Vortex ones are as low as you can go but if you want something between the height of the Vortex and the stock bars then go for the Woodcrafts.
There is a bit of work in fitting them but if you've got a reasonable set of tools and some practical ability then its a fun job if you take your time.