I've had my Oehler 35P since '96. Won it at an IPSC shoot. (Still can't believe it was still on the prize table when I got up there!)
It doesn't do all the fancy stuff that some of the new chrono's will do, but I do still have some math skills, and it does me good to use them sometimes.
It's been "bullet proof" all these years. Only thing I've done is put paper and ink cartridges in the printer and a few batteries in it. I like that I can take the back off and shut the printer off when I don't really need to use it. Wish I could do it from the outside, but it's no big deal to take out four screws.
Don't really see the need to spend any money on anything else until this one is dead and gone. At the rate it's going, it may outlast me.