As you all probably know by now, I am strongly in favor of all beach cats having some sort of masthead flotation, and it is probably especially important for cruisers (non-racers) who tend to do a lot of sailing when there may not be other boats around. However, (and I think I have mentioned this before, too), there is one thing you should be aware of if you use a Hobie bob. I discovered this with our Hobie Waves -- the bob floats the tip of the mast so well that once the boat capsizes, it tends to go skating downwind faster than if the mast were digging into the water. So in the event of capsize, make sure somebody holds onto the boat, or it can quickly get away from you.
Of course, any boat can easily get away from you after it capsizes, so holding onto the boat or something attached to the boat is always the primary consideration. It's just that the bob helps the boat get away a little faster.