I have both the WAVE 2 and the BRICK 2 speakers. Both are good values, I think. The Brick 2 was $10 more and, for that, I think it is worth it. The Brick 2 is louder (not by a whole lot, but, noticeably), lasts longer by a few hours, and has deeper bass.
The WAVE 2 is much louder than I thought it would be, though, while maintaining sound quality. Both link up to Bluetooth very well. Both stay linked up for at least 25 feet inside a building.