I switched from a Nike vapor fly pro progressive set and was worried these would be a little too bladey for me but WOW. The tungsten filled cavity behind the head allows for it to have the work-ability of a blade with the forgiveness of a cavity back. Mishits give the feedback of a mishit without the loss of distance like a standard muscle-back. Still have that smooth buttery Mizuno feel they're known for and a great sound when you hit it square.
I bought an Excellent conditioned set of these irons and they are amazing. Definitely for an advanced player with limited forgiveness, but if played right there hard to beat!