I find the plastic frames flex when they are heavily loaded, not to mention the plastic is slipperier to hold then wood.
I got this one because I thought [!!!] that everyone [
] said they were good and I thought it would be nice to be able to grip those frames and be able to heave/rock back and forth/pull/ lift them out as the bees tend to draw wax between the upper story frames and lower story frames and work the frames free. Well, I have both wooden frames and plastic frames... Those plastic frames are slippery with this gripper. And NOW I support EVERY frame with the use of my 'other' grippers....aka hands!
Thanks for all the sympathy posts, guys...In all honesty, it's the little things [ie bees] that make this hobby fun and exciting and interesting....