Gruber's text is well-written and relevant. Admittedly not as concise as it could be, as a student I didn't mind the length at some portions because things were thoroughly explained. As economics texts go, this is probably the least "dry" I've encountered.
Gruber uses relevant and concise examples to illustrate points and inserts some humor to keep the read a little easier.
As another reviewer noted, this text can ramble on a bit much at times, but intelligent skimming through use of subtitles and keywords can avoid that. The problems are good, but at times can be more confusing than necessary.