I don't like this product at all.  Today it was delivered and my contractor first noticed that it request you to drill a hole in the tub which is not standard with other shower doors I have purchased.  He said he could use silicon to try and hold the guide in place but he did not think making a hole is a good idea.  He build my shower so it can be held up with 2 x 4 before he installed new tile.  The other problem with this door is the rail on top that allows the door to move back and forth is short and it's at eye level.  The other doors tracts that allows movement is 2 " inches higher. So the rail were the precut holes can't be raised any higher than 53.5 inches which is too short for a rail.  They could cut holes higher to prevent this problem.  I know it will always be strange to use a door that has a low tract that is eye level, unless your a smaller person under 5.8".