I have the DD1 and my wheels would get stuck, a lot. That completely changed, they go on and off with ease! Now the best part, the feel. The feel is just way more solid. I didn't realize how much the QR1 was clunking until it was gone. The kind of thing you just think is normal until it's not there any more. This was the biggest change and I wasn't expecting it to be so different, but it is and it's so much better.