Are the cheaper sub-$200 window robots worth it over premium models?

Verified-purchase and community reviewers say budget units handle basic flat glass surprisingly well, but they tend to lag on edge cleaning, navigation intelligence, and battery backup during power loss. If you have small/medium framed windows the cheaper picks are reasonable; for large frameless panes or exterior high-rise work, the consensus favors the higher-end Winbot W2 and W3 line.