I was thinking about the velcro option, and e-mailed Crossbreed about how much thickness it does (or doesn't add). However, someone brought up a good point: velcro wears out over time. I'm not sure if I want to go with that option now.
So far, the clips haven't been an issue for me, as far as concealment goes. I tend to wear black most of the time anyway.
And I find that most people tend not to stare at my waist.