I just built a 302 for my 93 lx with 10:1 comp. and used summit hyper pistons. I used them for several reasons, one i wasn't planning on running a ton of power, also they didn't break my bank acount, and they have better heat characteristics than forged or cast. hyper pistons are simply cast pistons with a 14-17% silicon content for stregnth and heat durability. Pretty much the piston acts much like fiberglass when heated where forged pistons act like clay if you will. Forged pistons absorb detonation etc.. instead of bouncing it around and that's why hyper pistons are not recomended for engines with power adders. They can handle a tremendous amount of power, but if an engine part fails, or detonation occurs the piston is more suseptable to catostrophic failure insted of absorbing detonation or a valve for instance, the piston will bounce it around because of its "fiberglass" characturistics. Hyper piston excel over forged in the fact that they handle heat very well and because of this they are cut to a much closer bore-piston tolerance and can also be held, technically, to a much closer valve to piston clearance as well. As far as weight they all vary. I know summit hyper pistons and keith black hyper piston are different in weight where KB pistons are lighter. Hyper pistons do well in alot of areas and as far as power most good hyperuectic pistons will rate at 1.5-2HP per cubic inch. Like someone said earlier if you are running a moderately moddified engine even in the 4-500hp range with no power adders (nitrous, superchargers) hyperuectic piston take advantage over others because of their superb heat resistance, limited exspansion when heated which results in a cooler cylinder, and a decrease in compression loss over forged as well as safer piston to valve clearances, however I would recommend forged for applications that would include poweradders simply because forged pistons are proven whereas hyper's are new to the market and forged pistons provide a safety net in case of detonation or a dropped valve because of their absorbing properties. I use hyperuectics in N/A app's and forged in poweradder classes. Hope this helps!