Because they might as well be made of tin foil, that'd be a hell of an improvement.
Mine was nothing but hell and I ended up dropping an Edge in my '470, and haven't looked back.
The TRS was in my guitar for a whole month, now it's in storage, but I looked at it the other day. and you'd be AMAZED at how rusted, corroded, and grimy it looks just from sitting in my drawer. The cosmo seems to deteriorate by the hour.
The Edge I got was like 10 years old, and it's got slight wear on the the top of hte pivot area on the E and A string saddles, ever so slight, and it's held up perfectly fine. This thing will last longer than Cher! That TRS barely lasted that month.
It's just weird that so many other people do fine with theirs, I must have gotten an absolutely horrible one, but I had all kinds of problems with it. Strings would always pop out, so I went from lightly clamping them to having to clamp them tighter and tighter as the problem continued, and finally I just couldnt handle having half step bends rip the string out of the saddle. Pathetic. The TRS saddles were made of really soft metal apparently, and no matter how gently I clamped them early on, it would eat into the saddle. And I kept having to clamp them tighter and tighter. And the last time I bothered using it, as a last resort, I just clamped them as tight as they would possibly go, and I could feel the metal giving way, and there was never any solid "this feels snug" feeling about it. No matter how you did it, it always felt weak.
The Edge gives you a VERY solid snug feel. You know when the stirng is clamped, and the metal the saddles are made of can handle it.
(For the record, I was using Blue Steels at the time, does anyone know if maybe Blue Steels are really hard on double-locking trem systems? That might explain it, but I doubt it.)
The TRS, since a half step bend would yank the strings out, was hardly ever even moved. But sure enough, after a month of EXTREMELY gentle use, the knife edges had huge (1mm probably) dents in them from the posts. This is just from string tension alone with .010's.
I'm never getting any cheap trem'ed guitar ever again. But at least that 470 turned out to be a hell of a guitar with the Edge in it. I love it. But I learned my lesson...