"USERS" Advice
I only gave it four stars because I took "Users" advice and had to do some minor surgery. It would have gotten two stars beforehand. Really some good advice. "USER". It now works perfectly, all the time. I can't believe Pioneer would hire engineers that could overlook such an important design flaw. They should probably be taken out and shot, or at least fired. Maybe sent back to school. Oh well, I am glad I had to opportunity to get a steering wheel control, and thanks to the reviewers on this site for helping to make it much better. BL

Works okay
As I researched this purchase the most common complaint is that it doesn't work in the bright light. I have found this is accurate. Otherwise this works well.

works great but needs a better mount
Like all electronics, Pioneer has its good points and not so good. Two examples: I have their top of the line NAV system in my car and it is fantastic, but the use of light colored side roads makes them difficult to see in the day - almost useless in bright sunlight, and no control can help that. (Are you listening, Pioneer for the next update?)
So again, the Pioneer Cdsr100 Steering Wheel Remote Control works great but the mount has a poorly designed clip to keep it on the steering mount. Having said all that, I would still purchase both of them again. I did a month of research before deciding on Pioneer for my 3000GT.
J. Sharrock

Dont buy it if you are looking for something to attach to the wheel
I bought this about 2 months ago and it does not work if you attach it to the wheel. I always have it detached and that is the only way to use this remote.

Need advice
Please I need every users advice about this unit before i buy it, Does it support the Keenwood Unit ot just Pioners????