x2. Get them and don't look back.
Also, pick up a grease gun, a flexible hose attachment, and some Green Grease (greengrease.net). The stuff is better than the Superlube T/C normally runs, but hard to find without ordering.
They will let you know when they need to be greased, but assume if you run in dry/sandy climates, grease them after any long weekend in the sand/dirt, or otherwise just do it when you feel the need, or if they start to make popping noises at the bushings--means the bushings are getting dry.
-Sean