Bill,
While it's not the EFA with the options you mentioned I have a Kanati angle Pro quiver so in theory, I guess, it's close to the same thing. The Kanati is heavier so I will not comment on weight save for the fact the extra weight on the bow doesn't bother me. The only other thing would be the Hill bows are so light the added weight of the quiver does throw off the perceived balance a bit, but again, I've always shot with a bow quiver so it wasn't a bother to me.
The only thing I really noticed that might prove to be a nuisance is the low clearance of the support beam and the riser. It was very close. Yet, after spending some time shooting the bow with the quiver mounted I didn't notice it anymore. The only other thing I noticed will be a non-issue for you simply due to the different mounting systems the manufacturers use on their particular product.
Pointability, shooting qualities, etc didn't seem to be affected for me on my bow with the bow quiver mounted. My bow still maintained the pleasant little "Hill thump" at the shot. I hope this helped you out. I am looking at getting another Hill bow and am contemplating trying out the EFA quiver exactly like what you want so I would be interested to hear your thoughts as well.
A couple pics of my 66" Hill Cheetah:
Hope that helps you out.