Lance Ulanoff of PC Magazine gives a pretty extensive review of the LEGO Mindstorms NXT as he takes it for a spin with his 11 year old.

Bottom Line:
LEGO Mindstorms NXT is an excellent upgrade to an already worthy robot-building kit.

Pros:
Well-built. Easy to follow instructions. Fun and learning for all ages.

Cons:
Some instructions are all visual. Similar-looking parts can lead to confusion. Bluetooth lacks detailed instructions.