As posted elsewhere: the Push kit is a really good concept - coil performance for the first 2/3 of the travel with an adjustable anti-bottoming system. Fundamentally both the ACS and Smashpot are pretty similar there, and with any given spring rate you'll notice absolutely zero difference in performance during the first 2/3rds of so of the travel since a coil spring is a coil spring. Both have anti-bottoming systems which as a whole achieve a pretty similar thing. However, the Smashpot is cheaper, has internally adjustable travel, goes to both longer AND shorter travel settings, has a wider range...