I have looked at this a few times and thought about it, mainly for cases where it's difficult to get the tip *off* a fitting. For some on my tractor, I have to keep the standard tip very loose in order to be able to extract it afterwards, and it can let some grease squirt by when pumping. But that's still better than struggling to get a tip off. This product seems like it will eliminate that problem. But I wonder if the extra size of the LockNLube coupler is an issue for those of you using it on front loader fittings and other tight spots. Several of the fittings on my Kubota FEL are tucked away pretty good, and a pain to get to even with a standard compact tip on a gun.
Also, I assume it fits into the end fittings on front loader pins? I have about 1/16" clearance around a standard tip, so the LockNLube would have to be no more than 1/8" bigger in diameter than a standard tip.