I've had this unit for two days. I like a high resistance so I turned the knob as tight as it would go and cycled in my cubicle. After about 20 minutes I kept hearing a persistent squeak. So I reached down to fold it up and the black plastic and metal was so hot that I screamed and dropped the bike. Minutes later blisters are already forming.
I enjoyed using this machine yesterday even though I heard the squeak then too. But the fact that this unit gets hot enough to blister my hand and fingers makes it a huge risk. Please be very, very careful! Keeping my finger crossed that I don't have to get treated at the hospital :(