Bests & Worsts Reviews from Amazon

I got this treadmill about a month ago and have been using it for 2 hours per day, non stop at 4 mph, so I'm using and abusing this poor thing. For the first 2 weeks everything was going great, and than it started making a sound like I have a helicopter in the room. It was so loud I couldn't talk to anybody, couldn't hear music in the headphones and it was generally very annoying. Now today (3 weeks after I bought the treadmill) it suddenly went back to being super quiet. So overall I'm pretty satisfied. I've contacted the seller a week ago about the noise and hasn't heard anything back and that's why this thing got 4 stars instead of 5. Update: I used it for a while, and than it started skipping like crazy! I set it to 4 mph and it goes between 1.5 mph to 4 ,back and forth. I can't use it anymore because of how bad it changes speeds. I gave it a 4 start at first, but now it's completely unusable :( so no more 4 stars.