Love my Flex, but it's overkill. I'd go for a harbor freight one now (they didn't have them then). I'm sure the Porter Cable and Griots are fine, but to me they are a marginally better product than the HF, and should go for a marginally more expensive price, say, $25 more. And they don't.
If you really and truly use it six times per year, I think you can justify a Flex.