Am really glad that I didn't check reviews first, but Ryan came and replaced 40+ windows here last week. (there are 4 still waiting as they are shaped) It seems like I'm dealing with a different Ryan than the others reviewers here, though, that's highly improbable.
I have no cracks, no chips, every window is siliconed in, and I have no air or water leaks (anymore)
House is noticeably brighter, warmer and less drafty. Probably a 3 degree difference before vs after in my daughters room on the windward side of the house.
Sorry for everyone else, but personally, I had an excellent experience with 95% being done professionally in under a week. If this changes as the last 4 get done I'll update this.