I have been studying Lithuanian twice a week with a professional instructor now for 3 months. I own this text, as well as the Beginner's Lithuanian text by Dambriunas. The Colloquial Lithuanian has very useful exercises, and emphasizes the conversational forms and expressions over the tradional academic style employed in Beginner's Lithuanian. However, be forewarned. This Colloquial Lithuanian text is absolutely inaccessable for beginners -- it does not lay out the fundamentals, but instead stresses memorization and modelling. This is good in a way, but not at all useful unless you know some fundamentals already. Similarly, the audio tapes of C.L. move at an advanced speed. As my professor says, C.L. is a "second-year" coursebook. We use it sometimes for exercises, but the B.L. text is much better.
By the way, the first reviewer should say "Vilniaus Universitetas" in the nominative, or "Vilniaus Universitete" in the locative. "Vilno Univeriteto" is simply wrong -- Beginner's Lithuanian can cure that mistake, Colloquial Lithuanian cannot.