I built a steady rest in the fairly common design using a 3/4" plywood circle with 3 tabs holding skateboard wheels at the end. It works fine but it requires me to remove my 4' long steady rest used for turning back posts for rocking chairs. The spindle/workpiece of course is easier as it inserts into the center OK. In looking at the PSI steady rest design and reading reviews on Amazon I see several high level/pro turners who say it works great. I dislike the Oneway and a few other designs sold for cost and design as it will not improve me past the one I already made. I have a Delta steady rest casting that lacks the tabs & wheels. That design style requires much smaller wheels which I feel will give less vibration control due to small diameter plus lacking some resiliency as a skateboard wheel offers. My large rocker has a 45" post so a ~48" spindle workpiece creates quite a bit of whip and vibration.
Please share your thoughts & Thanks!!!