The pyrocat that I have, (one year old at Xmas), still seems to be fine.
I also shoot Tri-X in 5x7, as well as other formats. What 5x7 camera(s) do you use? I use a Kodak 2-D mostly, but I also have a Korona, a Gundlach and a Burke & James Grover monorail. (Which I keep wanting to call a "Cleveland".)