October 7, 2016
Due to the difference in actuation, there's a short learning curve requiring only a bit of muscle memory retraining when assimilating to the PushPush lever. While I experienced a handful of misfires during the first few rides, the lever action eventually became second nature and, given its simplicity, is one that may edge out the competition.
The ability to send the chain up four cogs with one throw was very useful when preparing for a sudden climb or coursing through highly variable and undulating terrain. When attempting the "4 x 1" throw, beyond the third click the lever distance becomes quite distant requiring increasing thumb pressure which may limit how fast you can realize the four-cog jump while maintaining bar control in certain scenarios.