Unless canned veggies are going to be your sole source of vegetables, I would think it's fine. Personally, I like frozen vegges a lot more, so I've never canned any. Who knows though really, there always seems to be a good argument on either side of the debate.
I've just always heard that if you're a natural or traditional 'foodie' that they are bad bad bad. NT says they should be avoided. I'll need to read the studies she posts, but it seems like they are fine to use.
I'd love to be able to can more veggies, so a pressure cooker/canner would be great.