Do they remove risky window work—or add setup and supervision?
Per-pane setup, safety tethering, supervision, pad care, streaking and real time saved.
CHIP finds excellent cleaning and a useful service station, while the category still faces weight, setup and supervision constraints that normal spec sheets underplay.
Official evidence is extensive; we are still separating exact-model independent evidence from related W2-family reviews.
Current indexed evidence is mostly manufacturer-originated. That evidence gap is itself important for a safety-critical vertical surface product.