yes i had a 525 sl the midas chokes were superb , made by briley i think ? unless weight is a issue , then consider titanium , I've used them in my ultra xs pro as they are invector plus worked very well !
Midas chokes are the heaviest choke known to man, good patterns though and look professional I posted weights of invector plus chokes in the "titanium " thread
Recently bought a 525 that came with them. So far so good. However i am lead to believe they throw a slightly tighter pattern that the standard invectur plus equivilent.