Mrs.V. has them and loves them. She lifts in them, walks in them, runs in them, goes to the store in them...I think last time we went to the theater, if it hadn't been a black tie event and they wouldn't have matched her evening gown...she'd have worn them.
Personally, I don't like them because I don't like anything touching my toes. when I sprint, it's barefoot. When I run for distance, it's in neutral shoes with good padding and plenty of toe room. When I lift it's in chucks...again for the toe room. But then, I've had a sensation of bees stinging my feet, nonstop, every moment of my life, for 12 years... if not for that, I'd probably love them too.
My left arch is now gone. That was what first interested me in them. I was walking 25 to 30 miles a day in boots for a while, goodbye arch. Things without support seem to relieve this completely...but the toes... oh well.