Ours has bubbles in it so when you step on it, it "pops" and scars the crap out of you....whoever put it down did a TERRIBLE job!!!
You try putting down decals on the floor and see how easy it is.
When dealing with a huge sheet of sticker, even with a squeegee and water, it is difficult to get it to lay flat. (I've done way too many of these and have spent more time than i should have, just to get the air bubbles out).
I curse the person who came up with the spiderman floor decal. Trying to get it around an endcap was a pain.
And let's talk about removing it. We have permanent dirt marks around the decals on the floor (from 5% off, the various toy ones (spiderman, hulk, etc.), toy deal of the day) and they keep asking me what those marks are...um...ask Corporate...they're the ones who decided it was a brilliant idea to have decals on the floor, which leaves an outline of the decal when removed, and not even the cleaning crew can get the lines to go away.
the best way to deal with the pops/crackles is to cut the air bubble, and lay it flat. looks bad, but at least it's not crunchy anymore.