Question to vinyl plank tolerances

[Andreas W.]

I would like to put down vinyl plank in a kitchen. The Trafficmaster specs say no more than 1/4" unevenness over a 10 ft stretch. The kitchen has twice the amount. So my question to experienced vinyl plank users is will the planks take 1/2"or is the 1/4" measure really the upper limit and not just a value that is determined for long term warranties. I have not settled on the kinds of vinyl planks and would be even open to sheet vinyl if I find any good looking ones. The stuff that the big box retailers store doesn't cut it.