I am about to buy a battery tender for my GS and I wanted to know if anyone had experience with the Battery Tender vs the Battery Doc.  Or if there were other models that I should look at.  As both of the above seem to have const. current and const. voltage modes, I don't know what other things to consider.  Size?  The Doc is natively smaller and international, whereas the Tender seems to be either large and international or small.  Thoughts?
-e

If you are in the US you don't need the international version.

Get a 1.5 amp model.  YUASA and Battery Tenders are both good and about the same price.

I bought a Battery Tender Plus and connected it to my battery, off the bike, last winter. It worked perfectly and fired right up in the spring. It's a good product, and their website, is the most information you could ever want on batteries. You can also hook up more than one battery in parallel.