The Moxy was my first real running pack, and I got it used on the real cheap, and I used it well for around two years! Being only 7L, I ended up needing more capacity for the things I was doing, but I did a couple of 20 mile runs and some solid run commuting with the pack no problem. The one thing I loved about the pack was that I never chaffed at all while wearing it. It was kinda a dream in that regard. Also, while I severely dislike anything with the color hot pink, I did appreciate that it made the pack really visible, along with the reflective logo on the back. I ended up run commuting a lot with this pack, and I liked having visibility at night on my way home.
I ended up also wanting a bit more pocket options around the front, and I also found that having only one strap in the front made for a bit of awkwardness in terms of fit. Ultimately, like you can see in the pics, I made it work and found it best to put it under my boobs, but if it had two straps it would have been better.
Pros:
Really comfortable - never chaffed
Felt bigger than the 7 litres it was
Really durable
Really visible
Cons:
Wish it had two straps on the front
Would have liked a bit more pocket action on the front