Hi
I have the VDO MC 1.0 and I really like it. Its very easy to use (which is good for me). It has all the normal computer stuff plus it gives trip altitude, avg climb, max climb, temperature etc.
It also tells you gradient as you are riding it - if you are game enough to look. I normally dont because if its nasty steep knowing the number seems to make it harder for me.
The instruction book is pretty thick so it probably does other cool things that I havent worked out yet.
SadieKate has the polar one I think and does cool downloads to her computer so she should be able to give you all the good gen on that one.
SK are you out there.
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The most effective way to do it, is to do it.
Amelia Earhart
2005 Trek 5000 road/Avocet 02 40W
2006 Colnago C50 road/SSM Atola
2005 SC Juliana SL mtb/WTB Laser V