I just got some macro tube extensions and needed something to test it out on. Aside from sitting very tight on the camera body and needing a TON of light (since they don't have aperture control), I'd say it was $10 well spent.
Last weekend I had a few hours time and finally completed a small project I've been trying to get finished: a useful lightbox that I could quickly put together and use.
Like the most of us - I think - we've tried to get good shots of our watches. While there's something to be said for...