Sounds like a great add-on.
Last summer the fuses blew on our converter (self inflicted), and it took us days to figure out that there was a problem. It wasn't until we had several straight days of rain before I realized, all because the pair of solar panels were doing such a great job.
So far, we haven't done any boon-docking, but that is in the plans for this summer, so we'll see how that works out.
I "cheaped-out" and went with a modified sine wave 1500W inverter for less than $200. The only things we need the inverter to do for us would be to charge the rechargeables (camera, walkie talkies, son's Nintendo DSi, cell phone) and to perhaps have a movie night. Our TV and stereo work just fine on the modified sine wave, so I saw no need for a pure sine inverter.
Chris