I have a set myself and I swear by them. Just make sure to keep them clean after each session and they will last you quite a while.
Midge, Can I ask you a few questions of how to keep them good as long as possible? Never owned a pair of high quality pencils before. Yes or no will suffice.. ;)
1. Mixing paint with it? Like x:y parts this and that....
2. Never let the bottom of the brush be covered by paint?
3. Use your saliva to maintain the tip after your done and cleaned them in water?