Okay, I am probably like a lot of you, looking to get back into shape, have a bike in the garage, wondering if I should get a stationary spinning bike or go for this cheaper alternative. I have a nice Trek hybrid, so i decided to purchase the trainer than to spend over 4 times the price for a nice spinner. I am glad i did. I am 6'2" and 250 pounds, so I am not a small person by any means. My bike is larger than normal, so I was a bit worried about stability with this trainer. It came in the mail today, took me about 20 minutes to get set up, and I was rolling.I went ahead and used the included quick release that came with the unit. Mine would have probably worked, but it was easy to pull the old out, put the new in, and be assured there will be no problems with fitting. Bike went into the mount easy, tightened securely. I started pedaling and was wondering why the heck it seemed very sluggish. Realized I had the tension set to the highest level, Lowered it, and the bike was really smooth. Surprising really. No issues with stability and after just 20 minutes I was quite tired (remember, 250 pounds). I have to say this was a great purchase. Don't spend unnecessary money on a stationary bike if you have a good one in the garage!!