That's an interesting story! I'm pretty sure the Micromark products are made by SIEG, too. Probably similar motors and controllers - scaled to save a few pennies for the smaller ones (or made for the smaller and used on the bigger ones to save some money). My SC4 was five years old in December. Due to some problems with fixing other things in the house, the last time I used it extensively was in the summer. It's possible it's starting to go bad, but when plugged into a plain grounded outlet - like manual says - it seems to work fine.