The Humvee photo vest my kids gave me for Christmas has one failing, shared with most other vests, I think. The bottom pockets... where you store all the heavy stuff...lenses, flashes, and the like, are too low. If you are leaning against a guardrail or crash wall, like I am all the time, the stuff gets crunched between your bod and the hard thing. Even my go-to fishing vest was guilty yesterday, because the wall was really high.
They do look cool,tho,(see the prior thread regarding cool photo equipment and photographing naked ladies

) but a Ferrari would, no doubt, help, too.
