Yeah, there is a guy on Endless-sphere who is using the Battery Medic to balance his Thundersky cells. I can't tell you which one is best because they all work and do something beneficial. It just depends on how you want to look at it.

The celllog 8s are nice in theory but look at all the wires that you will be coming out of your battery pack. For a 12 cell battery pack, you'll have 13 wires going to the celllog. I don't know. Just seems like a headache to me. When I'm going to go on a 35 mile ride that I would really need that? I might break down and buy one if I see someone who has set it up nicely and can convince me that it's not a headache. Just seems like another device to get stolen off your bike.