This IS a great shower door.  I'm a homeowner, not a contractor. And have installed many shower doors.  This is by far the nicest.  I shopped a number of doors in this class and this is the best for the $$.  I paid $799 at HD.  Now the BUT....the doors are 3/8 " and are heavy. You need two people, you cannot do a good install (read square and level) alone.  Check the level across as well as up and down before you drill.  You will be rewarded. The wall seal on the fixed panel can be adjusted to make up for about 3/16 top to bottom runout. Then clear caulk. Focus on making sure the slider is square ( although you can play the same trick with the seal on that edge if necessary but it's more obvious on that side.) Its heavy so make sure you double up on the studs that will support the bar that supports the doors and mount through to the studs.  Bottom line, prep and take your time.  The end result is beautiful.