Where can you find out how repetitive the patterns of a particular laminate floor are?
Have a look at this image gallery, but keep in mind that photo searches often introduce random unrelated images (like the bicycle team and warrior princess).

The most telling image&mdash;to me&mdash;is this one from here:

The break in grain and the prominent joint is something I notice right off, but it is also something completely normal in natural wood flooring.

My experience is that the monotony of a pattern can be hidden during installation by taking care to arrange the units in an order which does not repeat closely.  If you won't be doing the installation yourself, perhaps you are up to laying out like half the units in a desirable arrangement for the installer to use as is.  (They will appreciate not having to carry and open the packages.)