Here's a potential perspective:
How do you envision your use/use venues of the GP100? Carry? Defensive? Duty? IDPA/ASI? USPSA? Area 1?
For most of these venues, as long as the sucker works well (and without binding) for 200 rounds, I think you're fine. That assumes, of course, that you'll properly clean and lightly lube between uses, and that you're using quality ammunition.
For total anti-zombie piece of mind, I think the best test protocol is that devised by the Border Patrol in 1984 when they tested the Ruger Security- and Speed-Sixes against the Smith & Wesson Model 65-3 revolvers. That was a 10,000 round per-gun test, but with a 500 round continuous firing sub-test phase incorporated (for the Rugers, at the 3,100 round point in the testing) into the testing process; the average firing time per gun was 3:30 minutes going through 10 boxes per gun.
Every 500 rounds the guns were cleaned, WHICH INCLUDED REMOVING THE CYLINDERS FROM THE YOKES (my bolding here).
Spoiler alert: The Rugers sailed through (and the testers felt that the guns could be placed in field service after the testing), while none of the S&Ws lasted more than 2,500 rounds in what was supposed to be their 10,000 round test protocol.
Best, Jon