The best thing about the Hummingbird/ThunderMtn/Hidden Valley semi lates is the shock and spring rule, keeps the cost down a bit
I'm good with their shock and spring rule ....I can get a balanced car with fixed rate shocks and linear springs .....I 'm not a fan of their "no bump stops except right front" rule ....A rubber bump anywhere just makes a thinking guy faster ....they don't cost much ...I but the tube in 2ft lengths and cut to fit