These are much wider than Copa Mundials.  They are very comfortable, and for me comfort trumps everything.  When your feet don't hurt, you run faster, control better, and just focus on playing.  The kangaroo leather on the front half of the boot conforms nicely to your foot.  It's a night and day difference between k-leather and the cheap plastic most soccer cleats are made of today.  The rear half is mesh and hard plastic, which sounds bad on the face of it, but honestly, works pretty well.  The hard plastic heel guard really adds some protection.  The stud pattern is stable.  I mostly play or extremely hard ground with little to no grass, so I can't really comment on how these studs do on soft ground.  I love the super-long laces, although I wish they were slightly higher quality.  All in all, these are tremendous boots for the price.  Comparable boots made by Addidas or Nike would cost double the price these are, and probably even more.