I really like the $10 white Casio solar I got at CVS. It does a really good job with degrees/minutes/seconds which came in handy when doing gear setups.
Gear setups? That's really interesting! Do you mean gear ratios for transmissions and the like?
I've been using the degrees/minutes/seconds for astronomy calculations! It's funny because I bought the calculator after watching Dave do a review of it on the EEVBlog [1] youtube channel. He actually wishes they'd get rid of the DMS key in favour of some other keys he prefers for doing electronics calculations (polar <-> rectangular conversions). I bought it anyway thinking I'd have no use for DMS but here I am using it!