These are great shoes, but two drawbacks.  One, they have to fit very well.  And not just width and length like regular shoes you buy.  It's also individual toes, top of the foot, heel, arch, ankle. etc.  If the fit is close, try the next size up or down.  Give them a second chance, especially if you can return them.  Second, the protection is closer to barefoot than regular shoes, even some of the minimalist running ones.  So you'll have less "big toe" protection should you drop stuff or hit them.

If you're not used to these or minimalist shoes, gradually increase your walking/running with them.  It'll be like you aren't used to running.  Walk a day or two, then gradually increase the running.  Go by feel, your muscles will fatigue most likely and learn to listen to them.

These will also make you want to get better work and casual shoes - at least one that bend more and let your feet flex more naturally.