E-Z lube axles

My Rockwood came with E-Z Lube axles (not to be confused with Bearing Buddies).
Has anyone actually used this feature?
(Alert: I'm a retired ASE certified Master Technician. Please, there is no need to explain blowing out hub seals, the wonders of inspecting and hand packing bearings, the opportunity to look at the brakes, etc.)

Teach

I have the EZ lube bearings. It is interesting that Dexter recommends an annual bearing check, cleaning and repack even with EZ lube bearings. So, I guess I don't really get the advantage of the bearings for fifth wheels and travel trailers. Once, I used the EZ lube grease nipple to add more grease to the bearing. It takes a lot of grease and gets very messy later when checking the races and bearings.