Used an FX-11 with 30' of 5/16 chain on a 2520. Bought it after destroying several galvanized iron Danforth types (Boat US). Used it in water from 80 - 200 '. They will hold, however they they will bend too. If you have a winch you are likely to bend them if you get into rock. Never bent it in sand or mud. They are light but with the 30' of chain never had a problem with it not dropping straight down. I can vouch for their warranty. I would call and they would send new flukes and the shank when needed, I asked the lady how many times they would keep replacing the parts, she said as long as I kept bending them. I tried using a hydraulic press to straighten the flukes. Forget trying to beat them straight. Whatever type aluminum that stuff is it is tough. I liked that there was never a rust problem and the replacement was easy, just a phone call. If you will be anchoring in rock, the big Mighty Mite worked, they replaced it if when needed and the prongs could be bent back. No rust their either. Still used 30' chain with it too.