I have a bunch of prop savers. Just about have them all in a drawer. I kept loosing them in flight OR they weren't the right size for the prop adapter or they WERE the right size and even though a balanced prop would get them vibrating and a whole bunch of other problems that I eliminated....
By using a regular prop adapter.
If I ram the thing into the ground I'm more worried about the motor shaft then a 2 dollar prop. If the shaft is gone I can order another prop with the new motor. Prop savers made since back when you had 10 sub c cells in the belly of your light and fragile airplane that you had to javelin launch and land at just under maximum speed because of the heavy batteries. If you want to try it yourself, take your plane as is, then add a pound of lead under the CG. NOW fly it.
The Old days sucked!