TLDR; a great product for the price.  Easy install; think through the directions, though.

Looks very nice and seems to be of solid construction thus far.  It is pretty easy to install (I would say I 
am and advanced DIYer) though the instructions are not as detailed as they could be.  For example, look ahead when setting the wheels on the doors.  The drawings do not do a great job of showing the configuration, and I had to swap sides on one door (not hard, but easier to do right the first time).  It gives all the parts you need and spares, but be careful with the plastic circle inserts for the wheels; they fall out easily and disappear easily.  The rollers are smooth and balanced and it was a great steal at the discount I got too.

My only complaint is not their fault, the 72" height is as stated, but it feels very short for a 72" person.  I would maybe have splurged for an 84" one.  This is something to consider for your preference, not a fault of the product.