I have thought about the boom strut, but decided, so far, that it doesn't really offer any more benefits if you already have lazy jacks. They will catch the boom and the sail, and hold them up, so what more is the strut going to do? I think it would work for people who really don't like lazy jacks, as it would hold the boom out of the cockpit when you lower the sail, but it wouldn't catch the sail.
What I don't like is a boom slamming from side to side when the boat is on her mooring. Even more so when I am sleeping in the cabin, when the noise is horrible. I use a boom scissors support to hold the boom still. I am also considering building a permanent boom gallows support over the winter, which will probably horrify Matt, but I think it could be made to look OK