I found that I had to remove the insole when lifting with my PF Flyers. It was a little too squishy. Beyond that, they are very very similar to Chucks.
I have a pair. They suck for lifting in. Just get lifting shoes. Wei-Ruis don't cost a hell of a lot more than Chucks/PF Flyers and have everything you need.
PF Flyers. They're no Red Ball Jets, I'll tell you that much.
GhostWolf, thank you for bringing back a memory. It's been about 50 years, but I can still see myself in a little shoe store getting fitted for a pair of PF Flyers. Mom always insisted on "a good supportive shoe." (This has nothing to do with lifting. Hell, at 5 years old I didn't need to do anything to be heathy.)