Great! I have been meaning to get to both Saints Row the Third and Dues Ex for a while now. I have been browsing for good PC sales on them but being a PS Plus customer I will just wait to get them for free. I go to their web store on my computer a couple times a month and "purchase" all the free PS Plus games for my PS3 and Vita whether I want them or not. That way if I ever get an urge to play any of them they are in my downloads list to get whenever I want.
Same here. If I ever get a Vita, I'll indeed have an "instant game collection" of over a dozen games, including some AAA titles like Uncharted Golden Abyss.