The Powerhouse2 is 434Wh, from teardowns its made up of 36 18650 cells
In bulk the 18650 is $4/cell so the cell cost is $144.
So even at $330 reduced price, Anker is asking around $186 to pay for the packing, electronics. This is a product which is more than double the cost of the cell cost, for the box and electronics including the 120W inverter. An inverter of 200W with 4 USB ports is $24.
Contrast with say the Powercore 26800 which is made up of 8 cells so its cell cost is $32. I got mine in the 50% discount offer for $30.
So even at $330, the Powerhouse2 is well above the lowest price it is capable of being sold at given its raw costs.
I expect there is a better Powerhouse in the works, I expect it would be made up of Lithium Polymer and be greater than 120W. What would be excellent if it had serviceable trays of parallel cells which if one failed you could pull and replace with a guarantee of the serviceable parts being available for say 3 years at a fee post the free replacement under warranty.
I am still of the view one should shrink your needs to overlap DC devices so you do not have the power losses of multiple inverters. You already have the step-up inside the Anker products from 3.7V to 5V / whatever, to have the step-up to 110V AC and then the AC/DC step-down to a typical 12V-19V of say a laptop is plain dumb expensive when it comes to portable needs because it all adds up to a lot of weight. The efficiency of DC-DC converters is usually upto 96%, the DC-AC converter is usually 90%-95% so you're losing energy just by making AC. Then the AC-DC converter of the device (laptop say) is doing well to be 75% efficient so to make a portable powerbank with AC output is causing a lot of that very expensive $330 Powerhouse to be discarded as heat.
For that expensive air heater, you are lugging something 4.2Kg so that is 103Wh/Kg. Contrast with say the Powercore 26800 which is 100Wh and 0.5Kg so 200Wh/Kg so is half the weight per unit of energy.
Currently my most powerful device I'd need to survive off is my Pixel C, it is 3A 5C input and most $20-$30 Anker products suffice.
The cost of a powerful tablet which has a USB DC input is about the same cost as the Powerhouse2 and so you'd be better off spending money on a device which can be recharged off $30 Powercore. Then you'd have a lighter more compact device (tablets are smaller) and lug a much lighter external recharger. You could use some of that saved money and saved weight to pack a good size solar panel and use it to recharge your devices then potentially you could become portable off-grid for months.
I do own UPS for my AC-input devices, but these cost a lot less than the Powerhouse and have a lot more energy storage, they are not portable but by definition if you want portable you want portable everything including the devices.
So in summary, you're paying more than double the price, more than double the weight, for less effective energy to your device, in a "portable" package, with a product is non-serviceable with many parts of which any one of the parts fail will cause the product to fail. Way to go!