For $100 my guess it has a loud 2-cycle engine and brush-style generator, neither of which will endear you to fellow campers or your on-board electronics.
When I bought my Honda 2000i years back there wasn't that much difference in price between the 1000 and 2000, and the 2000 has done double-duty at home during power outages. A less expensive alternative may be the Champion line of generators but I have no experience with them.
"...run the lights..." And water pump, control boards for the fridge and water heater, TV, radio, ect. Stuff adds up. If you have a standard Group 24 battery you may get 2 nights out of it, less if you run the furnace.