I loved my Polar HRM, it was pink, it gave me an accurate count of my calories burnt, it let me monitor my HR while running so I could keep it in a steady in a working zone for my long runs. I was sad when it died a few months ago and although I've gotten used to working out with out it and guessing my calorie burn, I still miss it.
I like my Nike+. I love the online tool with it. It keeps track of all of my runs. Although its not 100% accurate (sometimes it is but most times its off by .10 of a mile to as much as a quarter mile) there is something I love about loading my runs to nikerunning.com and seeing my run, my route, my pace and mostly seeing it sent to my facebook page to brag how bad ass I am, he he he. Plus I love the training programs offered by the Nike Coach, I've followed the 5k, the 1/2 marathon-beginner and now currently following the 1/2 Marathon-intermediate-designed for a PR. But when I change my run, or try a new route or run a trail, I never truly know my pace, time and distance and that makes me sad especially when I'm trying for a PR for my next race.
Thanks to the federal government that is in the past and the present is my wonderful, accurate, brand spanking new Garmin Forerunner 110!