I have a spyder2express, upgraded to a GretagMacbeth EyeOne, then got a Huey for free at a color seminar. My experiences:
The EyeOne is spot on perfect, and has the benefit of being able to profile not only monitors but scanners, cameras and printers for a completely synced color workflow. It can also ambient profile the color temperature of light sources and camera flashes... even projectors with an add-on.
The Spyder did an okay job of profiling my monitors, but I never felt it was as accurate as the EyeOne.
The Huey has a terribly clunky interface. It consistently profiled all of my monitors with a magenta cast. It's ambient light monitoring and screen re-caibration where annoying. I also felt like there was something not right about applying tiny suction cups directly to expensive LCD screens...
I hope this helps.