I have been using the ShuttlePRO v2 for about 2 weeks now and I am super happy with using it in my Final Cut Pro X workflow. I am also working on a full review of the ShuttlePRO v2 as well as a few of the workflows I incorporate with it, stay tuned.
If you are editing in Final Cut Pro X, especially on a MacBook Pro, then you should consider adding this to your workflow. It fits easily in most laptop bags and is very portable.
Also, you can use this with almost any app on your Mac, not just Final Cut Pro X. It works great with Adobe apps as well, among others. I use it in Lightroom and Logic Pro X myself.
$99 on Amazon; http://amzn.to/1Oh9BPn