I have this one:

http://www3.towerhobbies.com/cgi-bin...XUSE1&P=ML

It's 39.99, which isn't bad. The gyro works, it comes with the Axe 400. It's nothing exceptional though. It's noticeably affected by temperatures below 32 degrees fahrenheit.

I really want to try this gyro, but I don't really have an excuse to get it:

http://www.hobbyking.com/hobbycity/s...dProduct=10113

At 13.99, that's super cheap, and according to the customer reviews it's quite comparable to the Futaba GY401.