As other reviewers have said, this is a great grammar resource: concise, clear and easy to use. It's also short enough to make it portable and is organised well.
My small criticisms, however, are that it doesn't contain a grammatical index which would have been handy. And that while it has practice sentences, it doesn't give you the translations as a check which rather evades the point.
It's always helpful to have a separate grammar from a learning text as explanations can vary in clarity. Recommended.