For some it might fit their needs perfectly, it just didn't fit mine. For me anything that isn't solar, dynamo, or won't take common size primary cells is at best only good for very short term use of a couple days till it runs out of battery, it's only going to run 10 hours at the medium setting so it's not going to last long on a charge, even the low setting only last 30 hours. So for a weekend storm power outage it might be great, but I already have lanterns that will cover that easily with rechargeable D/AA's cells that also take primary cells for longer term use, and a couple large USB power banks, and 20watt solar panel for recharging when the sun is out.
One of the reasons I like a simple common cell like AA's in emergency products is the flexibility. I can buy tons of AA cells for emergencies (home depot always has crazy AA/AAA sales for black friday, this year it was 24 AA's or 24 AAA's for $4, or a package of 30 AA and 30 AAA for $10, have rechargeable ones ready to go, use adapters to use AAA's in AA's and AA's in C/D cells and use the solar panel to refresh them when conditions allow.
Now if I was using the lantern for car camping, around the house on a regular basis in some application, root cellar etc., where charging would not be an issue it might be a perfect choice. If they had make the pack removable and offered a D/AA battery adapter that allowed the use of primary cells I'd probably buy one because I do really like the other Siege products.
One of the things people most overlook in a power outage, or even just striving to use less electricity is their car battery, you can easily charge a 15,000 mah power bank overnight from your car battery and still have tons of power left to start the car as long as it has a good battery in it and it's recharging itself for free every time you drive your car.