I was involved in the Bill Mayer group buy a few months back. I had him put the heating pad in the seat, I figured since the cover is being replaced now is the time to have it done. I'm glad I did, I commute every morning and usually wear my work pants while riding. After a few minutes I feel the warmth percolate up through my seat. No I don't need it, it's only 58 degrees out and I'm dressed right. Its a 25 minute ride, but at 5:15 in the morning it sure feels nice.
Is it worth it? To me - YES! This is my chosen ride, after years making do with what I had, and now that the family is grown and I have some disposable income, I am gonna make this my bike. Thats why we farkle these things.
If your gonna do it, here is a "hot" set up...
Get the cheaper unit, don't get a switch built in the seat. Just have him drill a hole thru the seat pan and feed the wire through. Add a Heat Troller to control the thing. Use the one built for heated hand grips, it runs off a 7.5 amp fuse. Install the switch somewhere on your dash panel and hook up the seat with a GM WeatherPak connector. A really low setting with the 'Troller gives good warmth, and according to my Datel its quite easy on the battery.
This is a good "passive" system - you don't have to dress any differently, or wish you did when it gets chilly. As always - Your Mileage May Vary.
Brodie