It does actually reduce electricity usage by some amount, like at 32F setting 11 Watt without, vs 9 Watt with this cover (measured with killawatt over 15 hours). Seems like a small difference, but may be a big deal if a fridge runs from a battery. It has all proper openings for control panel, cable attachment, vents, handles (comes with its own straps which are pretty convenient). Opens really easy. Has a bunch of convenient pockets on the outside for cables and other stuff. Protects the case. Seems like only advantages so far. Nice value for money.
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