I'd like to see the citation on that (there are no GM tomatoes on the market), I'd also like to add that the 'watery', huge, flavour-poor tomatoes you often get in Europe have been created by traditional non-GM breeding: http://blogs.discovermagazine.com/notrocketscience/2012/06/2...
Shockingly, I was alive in the mid-90s :) It's also a given that any GMO tomato would be a hybrid, a.k.a. a cardboard-esque rubber ball. A little experience and common sense can go a long way in determining something's flavor (lol)!
"You don't need a weatherman to know which way the wind blows."