The instructions are clear and it took about 15 minutes from unboxing it to having our first bowl of popcorn. You don't use oil or butter to pop the corn but the measuring spoon which forms part of the domed lid can be turned over during the popping process to melt butter ready for the corn when it's done. Using their measure, you'll need a fairly big bowl to avoid overflow. 100% of the kernels have popped every time we have used it and there haven't been any scorched ones at all.
The reviews here left me uncertain. But I could not take cooking oil for popcorn anymore...too unhealthy. We had to leave our air popper in the usa when we moved. This lovely lil gem will quickly pop to completion, leaving nearly none to no kernels behind uncooked. Using an organic popping corn, the popper achieved full fluffy popcorn. The trick for those complaining about it is: do not overfill the cooker. There is no line on the metal cup cooker within as there was on our old popper, so I only poured to just at the heater openings, because that is about where the line was in the old popper.... this still makes a large amount of popcorn! How much does one need at once? This allowed for a large bowl to feed three adults and our golden retriever lol! Additional info to help out: The butter cup should not be overfilled either or it will leak into your heater, which might seem a bright idea until you have black burning butter/oil smell in the popper and it stops working well. I chop up goat butter and add olive oil and let the heat of the popping melt it as it pops and filled the bowl beneath the spout. Then I easily lift the butter cup and pour it over the popcorn. All of this I have described takes very little time for a scrumptious big bowl of yumminess.