You get what you pay for. Kenneth & Mock looks expensive but the movement and quality of their accessories (hinges, etc..) are better than the other brand I tried.

The only negative about K&M is that some of their simulated wood pvc tend to peel (bec. the wood design is laminated onto the pvc profile). But they have great service. Either they will fix it or replace the damaged portion.

RE: Alu vs pvc

- Pvc, by nature, tend to have a thicker window profile. So if the design of the house calls for thinner windows frames then pvc might not do (functionally, yes. aesthetically, no).