I used to love getting that sort of thing. Then disassembling and figuring out exactly how they worked. Knew all the different types of lead to get for them. All the different harnesses and sizes and why to pick one over the other. But after awhile I realized I was obsessing over the tools and not actually doing anything with them. My 'choice' these days is a el-cheap bic-biro. Not totally junk but not very expensive if someone walks off with it. Played around for awhile with the gel ink style disposables. They have a nice clean line usually.