I've used this several times since it was purchased.  The only issue I've had is the kernels jumping out when it first starts to pop.  I've solved this by laying a small tea strainer over the popping chamber until enough pops to start pushing out of the top.  I believe this pops faster than those bags of microwave popcorn, but without all the bad oils and flavorings.  I just use a little butter and salt or the flavoring of my choice.  I would recommend this popper as an indispensable small appliance if you love popcorn.