If you like pill boxes, not bad. They are a bit alike though. Ones I visited had ww2 graffiti on the walls and full of barbed wire dating back to that time. Access varies from walk in to squeezing over the top of the gates, Didn't find one I couldn't get in, but doesn't mean all would be accessible.
I had plenty of time to kill as I was working out there for a few months, probably wouldn't make a special visit though.