I know Brock LOVES Iron Man so maybe that is the one he has had the longest?
Brock sold his Iron Man earlier this year otherwise I know he has had it since December 2011.
I haven't used Titan rubbers before on any of my games but I know my friend bigbossfan put Titan coloured rubbers on his creech that he tore down to clear coat earlier this year. While the playfield was still sitting on the rotisserie he had some Titan coloured rubbers installed and they snapped less then a few weeks later. Giving bigbossfan the benefit of the doubt that he installed the proper sized rubber rings on his game it is a bit concerning since the game wasn't even being played. Also bad too if you are installing these rubbers in hard to reach areas once the game is put back together. I think spiroagnew had a similar experience when he installed some Titan rubbers on his EATPM and they too prematurely broke in a very short period of time. I'm hoping both of these guys can confirm it was regular coloured rubbers they had installed and not the competition ones.