These images shows them opening well past the roof-line.
Again, I'm not saying that I want them, or that they fit everyones needs- I am just saying that they are clearly a well-designed and well-fabricated product that looks as good, or even better than the stock design. I believe that the feedback placed on this top would also agree with my statement.
Something to consider, as well, is that these tops seem to great for back-roads and areas where you won't be traveling more than ~15mph. At such slow speeds, the convince of being able to place oversized objects in the back of a TJ seems well worth it to me(i.e. Kayaking gear, rock climbing gear, etc...)
As well, after looking at the photos- those side windows look to be fairly easy to remove... just something to consider...
My issue, really, is not with the top- but with the negativity I see. Often times, members are so incredibly negative towards ideas that don't jive with their own personal concept of what a Jeep should look like, and unfortunately, I believe that such negativity is hindering the creativity on the forum. (A perfect example is the negativity towards color-matched fender flares on Saharas- I've read dozens of pages with members battering Sahara-drivers, pushing them to paint their flares black... There's just a bit of a "cookie-cutter" attitude around here)