On some engines, guys do use them. But on a 525, they really just aren't needed. The problems with rockers breaking in your typical marine performance engine, is fairly uncommon. While the T&D, Jesel, and other shaft rockers are nice, they are quite a bit a money from an upgrade standpoint, and they also have a fairly limited lifespan on them. I think with the proper spring setup, and a set of quality rocker arms, there's no reason conventional rockers wont last a long time in a 525 based engine, that will never see north of 6k rpm.

How high does the reflash raise the peak rpm & limiter rpm? My boat is propped now to hit the limiter on perfect days (5,400).

You can get it where ever you want. I'll get them set to 6000 rpm, but prop them for 5700 or so with 91/93 octane. With 89 octane, I have it set at 5800 and prop for 5600. You don't really want them to hit the limiter under normal circumstances. It's there for safety measures.
Eddie

They do come alive with a few more RPM, 5700-5800 seems to be a happy place for them. If you have the right internal part that is where they seem to run the beast.

I've been told to run my '07 vintage 525 near the 5,400 limiter and that is what I do. (when running flat out for short periods that is) When running light and on cool days I can get the rev warning beeper at about 85 mph. This engine does have the cometic head gaskets and supposedly new style headers.

If your engine is a 2007, it will have Cometic head gaskets, ARP head bolts, and the newer style headers. The one thing that you want to check is the rocker arms. Look in the center of them to see if the poly-lock is rubbing the body of the rocker arm. That will indicate worn out bearings in the trunnion.
Eddie

At the 21mm. We are in the same cove as shorty pants, the old yacht club location.

Thanks. That will be convenient. We always go to Shorty Pants.

Eddie do you have a recommendation on rockers, what rockets have u been using and have had good results with?

Ive had good luck with the estes brand.