It's quite thin when it's a new bottle, but I've left mine open overnight more than once, so my current sample is a tad thicker than before.
But it's not stringy at all.
I've heard good things about Tamiya's extra thin cement, so I think I will get a bottle of that and try it out next time. Thin glue is always very nice. The reason I love the Gunze so much is that it actually works like plastic cement is supposed to, i. e. it actuall melts the plastic and bonds them together. The Testors crap is very weak in that regards. It does the job, but not as well as the Gunze.