So Guinsoo/Bloodrazor Vayne...

It's been proven that it's not as effective as a regular build but I gotta say that this build path is very veery snowbally and sadly it's a pubstomber as well, this means that at low gold and below people will see quite a bit of success with it since shutting down a lane is not going to really happen and eventually you'll get both items, fights are longer in lower elo as well since everyone focuses whoever (except vayne of course) and she'll have the time to stack the 6 hits, not to mention that they stack on towers and of course the build has a heavy load of Attack speed.

On my last game the enemy Vayne would stay in her jungle stacking her stuff and then waddle in with devastating results, for us that is. Also, taking baron for them was astoundingly easy even after having a tank fizz, a 1/6 shaco, a 7/12 annie and bard. I admit that vayne played her cards well but man, that was some serious high reward for 10 minutes of "risk"

I don't think that low elo can be taken as a point of balance but with a bit of skill on Vayne, you get a free pass on the freelo train :/ it feels really bad because I stomped my lane and helped the others but in the end we were hopeless :S