I’m the proud owner of a colonial and I absolutely love the round faced lock. Quick and sparky.I don't know where comments of problems comes from, but I largely think it's BS. I have my ideas where it has originated from as well. All it takes is someone who is know for running their yack constantly to start rumors that perpetuate. Maybe some of you can guess...
As an example... When we first started making locks years ago, some of the very first mainsprings were not hard enough. With this the case, they weakened over some time. There weren't many like this, and we offered to replace them, but I still occasionally hear about this. Something to the effect of our springs turning soft or some BS. Usually it's some custom builder who has ties to some of the old entrenched lock makers.
I would put our locks up against any made today and feel confident they are higher quality now and will be as the gun ages.