WE have the EZ Lube system on our tow dolly. We have only had it for 18 months (we are the 3rd owners of it though), and judging by the look of the bearings when I took everything apart when first got it it works very well. The bearings looked good and were well greased. My only concern is the rear seal, is it possible to blow the seal because of putting too much grease in? Dexter's web site is far from helpful on that point. Presuming they are the original bearings, I would say that the EZ Lube System is an unqualified success.