Excellent question, reader! And one I researched myself before purchasing my Polar F7.
The only difference between the F6 and the F7 is that the F7 chest strap is a much more comfortable material than the F6 plastic strap.
Comfort is extremely important to be while working out, as I tend to get irritated easily by things that touch me. For me, it was worth it to spend the extra $20 and get the F7. Again, the material of the strap is the only difference. You even get an F6 handbook with your F7!
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Exercise, Unknowing questions from readers
Hi all. I started this blog back in November, 2007 to write about funny incidents and vent about stupid people. Somewhere along the way it morphed into a healthy living blog with some funniness and stupidity mixed in. 
That is why I got the same one as you! I could barely feel it during my workout today!
http://www.missymaintains.blogspot.com
What’s your workout regiment?
Exercise when I can!
Would you happen to know how short you can make the strap for the F7? My wife is very petite and I’d like to get this for her.
Thanks!