Yeah, this cat wasn't getting it, lol. I think it was because he was basically semi-feral when I got him, was raised by a homeless man and did what he wanted.
My current cat is four and a half months and I have had him for a month. So far all I've had to deal with is cord chewing and excessive meowing, and hiding the cords/no-bite spray + giving him praise/attention/treats when quiet and both behaviors have improved both behaviors dramatically in a short period of time.
Didn't think he'd kick the cord habit (made a thread about it recently) but he's doing so much better, in the span of like 10 days.
But yeah, that was my point essentially--some cats are easier to train than others. I think too often people are like "well the water bottle worked for my cat! What are you doing wrong?" instead of acknowledging that what works for one cat won't be sufficient for another.