I initially didn't like the fact that the controller uses two AA batteries and isn't rechargeable, but the life seems to be good so far. The system itself is tiny. It's about the size of a baseball, so there will be room for it, even if you're tight on space.
It's free to develop games on it, so any games that meets their minimum requirements will go on their games list. The result is many games that look like 1983. Now that might be frowned upon by 15 year old kids, but for me it's just fine.
The funny part is that although many of these games look 15-30 years old, they have modern stereo sound and a 1080p resolution. This kinda reminds me of the fantasy genre, where they are living in 440 AD but have super technology and sorcery.

All in all, so far it's a great value for me. Does anyone else have one?