Also got some in Kenny's recommendation some time ago, have yet to try it out yet but from what I've seen will help a lot, especially in the slightly harder to solder places on the board.
In regards to tips I've found that the very small ones are actually kind if useless. They don't have the mass to keep hot enough and you end up being unable to really use the end of the tip on them for this reason. I got a medium sized one on iron as it's a nice balance of mass and size to allow you to solder the hard to reach places whilst also keeping enough heat in the iron to get the job done easily.