Pros : Always had trouble with a water source for grinding (not impressed with the little sponge business)and this works great. Used a clothes pin to anchor tubing to face shield over grinder and can now position dripping water exactly where I want it. Did have to think about what to set it on as my grinder is on a small, movable cart and there was not enough room for the wing span of this device. I put a dish drainer tray underneath the grinder and it is a perfect fit. If I grind for a long time, water pools at the edge that normally goes into the sink and I can put a papertowel there to keep it from dripping onto the floor.
Cons : As above, need to provide "counter" space large enough to accommodate the wingspan.