I have a Williams FP-336 on mine and find it is very fast to use and amazingly accurate, way better than the factory rear sight
It's a 5minute job to fit it, it just screws into the rear scope mount holes on top of the action and you get a bit of a sight radius increase because of that too.
The FP can also be used as a ghost ring sight by simply removing the aperture.
You will gain some sighting speed but probably lose some precision, its's leaves a 3/16" sized hole there.
Also, you can retain the factory front sight if you choose and save some $$ that way with this option.
It really depends on how you are planning to use the rifle as to what sight setup you go for.