I have problems downloading pdf's for some reason. If they are the 87mm Wiseco flat tops with ceramic coated skirts, then they seem like a good item (I have used a few sets of these in different projects, and IF you are interested I can get you a price on the Wiseco's). Using those pistons does add to the cost of your engine build because you need to have your rods modified to suit the full floating pins, and your machinist will charge more for taking the engine out 2mm.
I have SPS custom items in my engine - I have posted their details on a number of occasions. SPS offered very good and quick service.