I don't have a steam vac per se, but we recently purchased the Shark steam mop, and I can tell you I absolutely love it. It works really well and I don't have to use any chemicals to know my floor is disenfected since it is being cleaned with steam. I also use the carpet sweeper to go over our carpeting, and that works really well. For old stains, I use a little bit of Basic H by Shaklee and it works wonders - it removes even ground in year old stains like a magnet. If it was a urine stain or something, then I go over it with the steamer just to be safe but this works well for us. Oh, and about getting your carpeting chem-dried, please don't. Infusing those toxic chemicals into your carpeting is never a good idea especially with little ones walking around. Even though you're thinking of covering it up, doesn't matter - those chemicals leak out and would affect your air quality for a long time.
Contact me if you'd like more info. - I do rep. for Shaklee.
K.