The good:
I had fun building an enclosure for my Atari <-> PC serial adapter board out of legos, and I love the result. Been too long since I played with legos. I need to dig up the rest of my legos so i can make some enclosures for my ARM boards.
The bad:
I picked up a 1 gigabyte USB drive in the shape of an off-brand lego block today. The price was right (< $10), but the implementation is depressing -- the fake legos don't stick well and so the cap can't be mounted on the drive body when it's in use. And the size isn't lego standard, so it can't attach to other blocks.
The ugly:
In a better world, Lego would be an open standard. The patent expired in 1988 (according to Wikipedia. But the company still has lawyers, who seem busy doing what (corporate) lawyers do.
Meh. Legos were more fun to play with when playing with them didn't involve worrying about patents and copyrights and the market's propensity to deter standardisation.