Very handy for putting my bash scripts in the menu bar! I currently have Magic Mouse battery level, Weather for my area based on my own bash curl command and an energy peak meter (tells me when I am off peak for doing laundry etc.)
The developer is super friendly and responds to emails very quickly.
Download trial is 7 days, but I bought it within 2 because it is worth the $$.
Only reason I give it 4 stars is due to some very minor graphical things, which the dev has assured me he is working on.