I recently had to replace a pair of Nike cross-trainers and was looking for something that worked well and looked different.  I've worn these a couple of times since I got them and while they aren't the worst shoe I've ever worn, they aren't quite what I was looking for performance wise.  To give you an idea, I'm very heavy and wear between a 5.0 and a 6.5, depending on the shoe.  I have very high arched, medium width feet and ordered these shoes in a 6.5.  While the length of the shoe was fine, the way the shoe is built doesn't allow a lot of give across the instep.  So while I started off fine; after about 15 minutes, I needed to take them off and adjust the laces so that they were completely loose acroos the instep and toe box.  I think if my arches weren't so high, these shoes would be great.  Sizing up a half a size may help if you do as well.

That being said, they are very light weight, which I love and are very pretty.  The photo doesn't show the contrast between the yellow and green as well as it looks in person.  I'm hoping that wearing them a bit more might help break them in a bit.

*EDIT*  After trying these at the gym again, the pain was just unbearable.  The seam was just too tight across my instep on the left foot.  I measured the seams and found that there is nearly a 1/4" difference in placement.  I cut the seams on one and found some relief, but will stick to other brands in the future.