i used the Source Fluid Damper for a few years, thought it was good but my engine had issues with bolts coming loose all the time. an engine builder down here told me it'll be because of my fluid damper. so when money became available i bought a ATI Superdamper. surprisingly i don't have a loose nut n bolt problem anymore. also the Fluid damper was tight as hell to get on & off & yet on the crank snout under the damper i had fret marks. i had the crank polished & these marks removed. 4 seasons later when i stripped the motor for a freshen up, there were no marks under the ATI damper. i'm a firm believer in quality dampers now, nothing but ATI from now on.