I really like the higher end material. The normal stuff is essentially the thickness/feel of photo/transparency paper. The deluxe stuff is more like a true translite type material.
I've done both...but only used the cheaper stuff once and will continue to pay the extra for the better stuff from now on. (Note: The cheap stuff still LOOKS good... and would be fine if you plan on sticking it in the marquee and never removing it...I just like the better stuff enough to pay for it)