I'll link some youtube videos to show you the generations.
Newest gen Warrior:
http://www.youtube.com/user/roger649?blend=3&ob=5#p/u/0/AmyMWDM4vdQMost common Warrior:
http://www.youtube.com/watch?v=CGahf6H3GJs - This is also the model I own, circa 2008 I think
Earliest Warrior:
http://www.youtube.com/watch?v=VTyuujs8Eyk&feature=results_main&playnext=1&list=PLFB9543CDBC03D482 - This one had the most issues, completely unlike the other models. I've never played on this one though.
My table warped because of my pullshot, brush passes, pin, anything that applied downward pressure on the play surface. My pull is set back pretty far (as all good closed handed pulls are at the release point) which creates more force on the playfield, hence the warpage. Also, when I walk the ball using my pin, I'm pretty aggressive, so that added to the warpage. The area between the 2 bars and the 3 bars is especially warped, since both my long push and my long pull from the 2 tended to stub a lot at first, which was strenuous on the table, combined win the constant pinning from the 3.
There are two areas on the table that split. One was a split the full length of the sidewall (ie: if you removed the top laminate on the sidewall, you would see a crack running the length of it). The other was 2 cracks in the white laminate in the inside of the other sidewall, which warped the sidewall, and now causes funny bounces during a 5 bar series. I imagine that both of these were caused by trapping the ball against the sidewall during play, which really is a common occurrence.
My table was kept in a carpeted basement room, which had humidity regulated by a dehumidifier, so moisture should not have been the cause.
I bought my table used, but it was only used for one tournament. When I first set it up it was mint, and had no damage whatsoever. I lived with roommates, and had friends over all the time, so the table saw daily use, 50% of the time by tournament players, until April 2010.
The bottom line is if it sees consistent heavy use, it will break down. On the other hand, if the table had the same play characteristics, but was as sturdy as a Tornado Coin-op, I would pick that up in a second.
Re: Differences between a new Warrior and a Fireball
I've played on both, and like both equally, but they are definitely difference beasts. The Warrior has those solid 'roid rods, which cause you to really lace into your shots. The fireball I played on had the ultra light rods, which felt like they weren't even there (which really was a good thing). The ball we were using wasn't the one that Fireball released, but I'll describe the feel as best that I can. The ball felt heavier than a Tornado or Warrior ball, and felt more rubbery; faster than a Warrior ball but slower than a Tornado. My entire game transitioned to it after a minute of play, and I could tic tac on the 5 forever, which I could never do on Warrior, and have a hard time doing at pace on a Tornado.