I purchased these shoes, since my husband recommended them.  I do like how they feel more natural to wear than, say, a pair of regular tennis shoes.  There are a few drawbacks, hence the 4 stars rather than 5.

The cons:  First, you have to be very careful with the sizing measurements.  These shoes aren't meant to stretch with wear, as the non-stretchable rubber soles wrap around to the tops of your toes.  Make sure you get the size right before taking them out for a spin.  Secondly, if you're going to be doing high-energy cardio, your toes might slip out of their slots, interrupting your workout.  Imagine doing burpees, and as you jump your feet forward, your toes shift out a little; you have to pause and make sure everything is still in the right place.  Thirdly, getting your feet into these shoes properly is of course a little trickier than putting on standard shoes.  You probably won't be able to slip them on in one fell swoop, although it shouldn't take too long.  However, I purchased Vibram 5fingers for my 3-year-old son, and it's so complicated getting those things properly on all his toes, I basically stopped putting them on him, and now he has outgrown them.  Moral of the story:  get them for older children and adults.

The pros:  I love how these shoes feel much more natural than standard tennis shoes.  You feel much more in touch with the ground below you.  Your toes won't chafe against each other--just buy corresponding socks.  These are lightweight, which makes you feel overall much more agile without big tennis shoes dragging you down.  I would say the Vibram 5-Finger shoe is superior for many activities such as walking, jogging, and other exercises that don't require a whole lot of intense "jumping around."  The look is one that takes getting used to, but I honestly don't care because they're great to wear!