We love these doors!  We waited longer to get the 74 inch doors and are so glad we did, so that a taller person doesn't have to duck under the track. The doors are beautiful and slide smoothly.  We did not install the threshold, because we put in a zero-threshold shower and wanted no obstruction on the floor.  Our floor is sloped to a linear drain and we have had no problem with any leakage under that door. Before the first use, we did apply a product on the doors to help reduce water spotting. That is one thing we wish the Vigo doors had applied at the factory.  Highly recommend these shower doors!