Well... it's only 2 days old! BUt the old battery woudl be unable to start him after a day (although it was on it's way out.). Even when just charged it didn't have much oomph ... the new one spins the starter quicker than it's ever spun and starts on first turn.
I wanted to fit the larger version but I've got LPG and the ECU lives at the edge of the battery compartment. I moved the brackets a bit to get this one in with a few cm to spare. Measure you maximum space and go for the largest you can get. The Yuasa's have a good rep and a 5 year guarantee to boot!