Gail I have used a ton of sharpeners! Prismacolor makes one and if you are lucky enough to get a good one you'll never need another one. they are cheap about $4.00.
I use mine or the small silver metal one. I had a great electric one that died and they don't make it any more! It is a monumental task to find a good one. I do think it is a personal thing.
CindyProud Fan Club Member
SCS # 9686