Only real complaints I have about the adapter cover are:
1) Not a lot of room to work. I already have a 1-1/2" 1/2" drive socket, and it won't fit inside the opening to snug down the heating element, so I have to go get a cheapo water heater socket wrench.
2) Not a lot of room to work. The ground lug has to be removable to facilitate the removal of the heating element. The screw has a 9/64" hex socket head, and uses 3/8" nuts, so unless you have a very slim wrench, or are very good with needle-nosed pliers, tightening the ground lug can be a pain in the butt.