I tested the 5635's before I bought our 6635 - what do you want to know?
Will it lift a pallet of brick? Only if you have all weight kits installed and you aren't on ground that slopes toward the truck, and you aren't trying to lift 3,000 pounds or more. And then when you get it off the truck, do not go very fast.
You could also use the method I've used for bigger loads, guys hanging their asses as far off the back of the skidsteer as they can as counterweight (in addition to the weight kits). That can buy you another 400-600 pounds, depending on your staff.
But for reference, when measuring my lifting needs against the 6635 and 5635, I bought the 6635 (and had the weight kits installed, too).