Both my specializeds… I think time just hadn’t been kind to the SX Trail, it was probably good in 2006 but by 2013 it was as heavy and as fun to pedal as a downhill bike and as capable downhill as a 140mm trailbike. OTOH I split it up, used some bits, sold the rest, so it worked out OK.
My Camber 26 OTOH was just a 2 wheeled abortion. Pedalled like a stumpy, weighed as much as a stumpy, descended like a bag of shit. Hateful, pointless disaster of a thing.
I’ve had a few other bikes I didn’t gel with but I’ve always at least got something out of it.