I think this is an awesome theme, if only it truly worked on all or mostly "all devices" as is the claim. I'm glad I checked out the theme in IE8 before putting much work into it. The visual quality of this theme degrades significantly in IE8 and IE7.
I checked my stats for "year to date" and see that 10% of my visitors used IE8 and 2% used IE7. I could live with something that isn't IE7 compatible, but to leave out one of ten visitors to my site is unthinkable.
Of course, that is due to the fact that my site is a business site and the crowd to which I cater. Still, though, it seems almost irresponsible to say that the theme looks great on all devices, as opposed to saying up front that it works with some browsers and not others.