it seems like they have taken care of the knock issue. you rarely see that anymore in the knock thread. if you get one that does make noise though, the 5 year / 100k mile warranty would cover it so you are safe on that part. no idea on the trans, from what i have read, people seem to enjoy them now that nissan has reflashed everyone and gotten the shift points figured out.
no idea on redesigns. haven't read of anything major going on
no idea on redesigns. haven't read of anything major going on