Yup, that happened to me. Loosened off completely inside the boot and lost contact with the plug. Put a little bit of blue loctite on them before install.
I ain't never heard of BR8ES with solid terminals, but I reacon if'n I had a choice I'd get em with the solid terminals. The only ones the got down at Drucker's store are the ones with the screw terminals.
I use them interchangeably, and don't even think about it. If you get a plug with a screw on terminal... just grab it with a pair of pliers, and give it a twist. (make it tight)