People talk a big game about how durable these pricy mechanical keyboard are, how they can be repaired and last forever, etc. I don't think it works out that way. Looking through these comments you can see people with the Ergodox EZ asking whether they should "upgrade" to something slightly newer. Once you start chasing keyboarding perfection, the journey is endless. Minutae loom large; you're never quite satisfied. It's best to just buy something reasonable and learn to like it for what it is.
I will say the Kinesis Advantage2 people seem to be more or less permanently satisfied, though. So I am tempted.