Always plan to get some new flat workout shoes, but always end up buying shoes that I'd wear out instead.
Anyhow, I use a running type of shoe and really no problems. I've taken some videos when I DL and can't visibly see any compression and notice that I'm more on my toes (not sure if that's bad form). One thing about flat shoes or bareboot, is that when you compare to actual weightlifting shoes, the dedicatied weightlifting shoes typically have a heel and are not flat.
Had some big grip issues before switching to over/under. Now my grip isn't the issue....just the weight doesn't get off the ground sometimes.