Yes it's a big advantage because the audience are people who are actually looking/searching for the product, service or information so the conversions are mostly high. Unlike convincing someone to visit your site or check out your product, in this case you're targeting someone who's already interested in what you have to offer.
Which will make getting a sale/lead much easier as compared to other traffic sources. I would say go for it, search engine traffic is really good and highly targeted.
Also check out Adwords, I've been playing around with it, it's a bit pricey but the traffic is really, really awesome.
Hope that helps.