I have a 1609 with cadence. Good crisp display and the controls are simpler to access everything compared to many other brands. Has everything I want without being too cluttered. Also has the option to use one on two bikes. You get a separate harness which codes to tell the computer if it is on bike #1 or #2. Keeps all the data separate for each bike. So just swap the head unit at will. Makes having one computer you know on two bikes easy. Also has provision for loaded to a computer though I haven't used that.

I have used Cateye double wireless. Good though less good interface.

I also have the $12 Schwinn (also same one with Bell on it). Has all the basic stuff, trip, total mileage, avg, max and current speed. Less crisp display, but readable. Display will sometimes fade out if left in direct noon sun over 100 degrees (comes back once you ride and the air cools it a bit).

The Sigma does seem the best quality of the few I have used.