Looks like a good bargain for a small generator. 2-stroke means you'll have to mix gas and oil and I'd be concerned about the quailty of the output - Electronics don't like dirty electricity (varying voltage.)
800 watts isn't much power, make sure you've done the math to make sure it will maintain everything you need.
The reasonable man adapts himself to the world; the unreasonable one persists in trying to adapt the world to himself. Therefore, all progress depends on the unreasonable man. - George Bernard Shaw
I have always considered Harbor Freight and their Chicago Electric (house) brand to be "disposable" power tools. They are well purposed for a one time use. I would have some concern if I couldn't pick the time though. Trying to start a 2-stroke engine that's been sitting for a year or more is tough enough, but adding HFs propensity for the lowest quality would really be problematic...
If you are interested in learning about reefkeeping or have a problem with your reef, our reefkeeping community is here to help. Feel free to ask a question or search our site. We have lots of experienced reefkeepers that are willing to provide free reefkeeping advice!
Besides being a great resource for all levels of reef aquarium hobbyists, CaptiveReefs is a social experience that will enhance your enjoyment of reefkeeping. CaptiveReefs is committed to connecting reefkeepers with the support and information they need to grow beautiful coral reef aquariums.