I've been using this for some time, and find it very good. I particularly like the 'All-in'one-Chart' feature.
I recently had difficulty when the version was upgraded, as one or two features and the access to them were changed. However, I got particularly helpful support from the developer himself, Nils Meier, which I thought quite impressive, especially as he's not a native speaker/writer of English (he's German, I believe).
Gets the thumbs up from me!