I think there's already a thread out there somewhere about this but I think the main issues with the coolant are that it's safe for aluminum engines and that it's nitrate\nitrite free. I used Engine Ice in my track bikes and racing motorcycle when I was roadracing and tried it in some street bikes but didn't really notice a difference compared to regular anti-freeze. Engine Ice is a great product; these were just my experiences.
I have been using Prestone 50\50 for some time. The engine in my woman's RSV4 is a nuclear reactor and it 's just fine running in the Florida heat. Just about any brand should be fine as long as it fits the prescribed requirements. Equally important though is the frequency of coolant replacement and the manner in which the system is drained, flushed and refilled. When I did my Suzook, I took the time to pull the radiator from the chassis and dump the residual coolant that was in it that could not be removed by standard draining proceedures. Doing the cooling system service correctly and taking just a little extra care is well worth it to me.
