I love using Coffee in my personal projects. I really like the simple interface and proposital. But to be honest I don't think it's expensive but I still don't see why I need to pay to use it.
It has the potential to be something useful, but I have never seen an app try so hard to hide the full features you get with the pro version before you actually purchase an item. I like their simple UI, but UX is not as good as it can/should be. Currently, there are better time-tracking tools on the web.
