Yup, they were either super tight or super sloppy. Mostly sloppy. BIL had one in his O/T Firechicken. It was always very tight and the ratchet mechanism just never worked right. Got a call back in the late 90's that he couldn't get his car in gear and was stuck, told him to try and pull the shifter arm up and down a few times while jiggling the T lock, when you hear dimes fall onto the tunnel you will be able to shift. Worked but the shifter was then super sloppy, no gates nothing, but could get the car in gear. Shifter itself was assembled incorrectly. For whatever reason B&M used a bunch of shims everywhere rather than spacers. Get the shims right it would operate smoothly, but most were assembled haphazardly. And the hair pin used on the shifter mechanism was more like a mangled paperclip. Worked on a few of these, seems like the common 'fix' would be the E-clip for the T handle and a bunch of the shims would be jammed on the outside of the slot for the T-handles operation, which would take the 'slop' out but the shifter would then just constantly be bound up. There was a sub-model of the Megashifter designed to fit 80's Mustangs, F-bods, and maybe even Corvette with consoles. F-bod models could be made to fit the 78-88 GM A/G with console shifters(Monte Carlo/Cutlass/etc). '90's was full of people who would have these cars and then buy every 'bolt-on' part. And since most A/T guys couldn't really do anything themselves they would claim they installed a 'shift kit' and show off this fugly B&M device. Considering what the 80's F bod shifters looked like, it actually was an improvement in aesthetics.
The Jalopy Journal
