It looks like a a really sleek package, easy to use, etc. But I have to admit: there's no way I'd lay out that much money on a non-serviceable appliance. Anybody who has had a cell phone, laptop computer, power tools, etc knows that for one reason or another within a couple years a lithium battery is just not going to work like new anymore. Then again... I'm one who finds or makes a way to service even non-serviceable things.
1002 Wh isn't all that much power. A pair of 80 Ah 12 lead batteries taken to 50% depth of discharge will yield about the same and will cost only (under?) $200. Yeah, they're bigger and they weigh more.. only you, can decide whether the premium for a packaged lithium-based storage box makes sense in your use case.
If you haven't already, it's worth a few minutes to estimate how much storage you actually need. CPAP equipment, for instance, is claimed to require 30-60 watts. Running that for 9 hours might require as little as 270-540 Wh of storage.
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