I have to agree with you guys. The J31 is a poorly built POS.
I've flown on them a few times in the last year on TSA between STL-MWA. BTW, TSA does not fly the J31 out of STL anymore, They sold them off to Corporate Airlines which now runs TWE J31 service from STL to smaller towns.
Anyway, STL-MWA is only a 35 min. hop, so it wasn't so bad. I flew on one of them in row 1, which is practically the jumpseat!
However these planes are noisy as hell, bumpy, they sway side to side with strong wind currents, and oh I almost tripped over the damn wingspar while boarding. They have no lav, no FA and no cargo hold, although the TWE ones have a pod under the belly for large bags. I didn't hate the flights, as I love flying and it's something different from the usual A320's and 737's that I fly on. But hey, if you don't like the Junkstream, try a C172!