At first I was really worried about the weight of well any of these grapples untill I started thinking, that is never a good thing! At 700 lbs a grapple would decrease the lifting capasity by 700 lbs, but not really my forks weigh 375 lbs so the increase in weight would only be 325 lbs and the center of gravity from the forks to the grapple would be closer to the loader arms than when say lifting a skid with the forks.
I am in the process of determining which grapple as well. I have read others, well before EA comment, talk about the weight issue. My bucket weighs just a little over 400 lbs according to the dealer. It is hard to get an exact number and I have not yet weighed it but it is a heavy duty bucket with a cutting edge. Then I add my trash forks to it which are on the bucket all the time except when I am actively cutting soil/rocks from a new area which is another roughly 200 lbs estimate (may be on the low side as I can't lift them and can barely drag them on smooth surfaces) for a 600 lb current weight. Now the Anbo is 740# by itself (800+ quoted weight is with shipping material/pallet) which is the heaviest that folks are talking about here so for me that is only about 140# heavier. Then you look at the distance from the pivot point (where most of the specs quote lifting capability. The Anbo is according to them 8 inches forward of the pivot pin whereas my Deere bucket CG is 16-18 inches forward of the pivot pin and the trash forks another 18+ inches forward from there. If I get the Anbo, it should potentially increase my FEL lift capacity even though it is about 140# heavier just due to the mechanics of the design. The L shape grapples due to design are more similar to the bucket as far as distance from the pivot point and thus the weight is more comparable to a bucket as to the effect on lift.