I have used vettas, cateyes, sigmas, and now have a polar 520 that I come to rely on for everything.
Being a bike-oriented polar, I get speed, cadence, average speed and average cadence, trip distance, plus the usual stuff like calories, heart rate, average heart rate, workout time, intervals, recovery time, and a whole bunch of other stuff that I haven't even figured out yet.
I bought it on E-Bay for something like $135.00 or so, which took me a while to get, but was well worth it.
When I ride, I just watch speed and average speed, but when I get back I can upload all of it into my computer and see charts and full databases of the complete ride, which is really fun cause you just don't have time to check all that **** out when you are grunting and heaving and flailing away. Plus you can enter it into a calendar which becomes an easy way to keep a good bike log. I am so far behind in my real bike log that it is hardly worth keeping any more.
I also use it when I go running, or out for a nasty hike with my 2 year old on my back in his backpack, or anything else when I think it might be fun to see what my heart is doing. I also have it set up for both my road bike and my mountain bike, and a push of the button toggles it back and forth.
I have sold most all of my other computers on E-Bay.
As far as the wireless goes, I love the clean installation. I occassionally get erroneous readings from one thing or another, and I think that is just the price you pay. The bad readings are far too brief to affect the overall averages or charts that you get with the polar, so they don't bother me too much.
That's my two cents.
whit