I have a Garmin 310xt and use the cadence sensor with it.

Prior to that I had a specialized wireless sport computer and used it with a Reebok HRM. No problems.

I got the Garmin because I found out that I have a congenital heart condition and was told to watch my exertion levels. The 310 xt will do vibrating alerts. I really like that on group rides so my HR alert isn't being broadcast to everyone around me.