I wanted to see if an acrylic mat would make the improvements Oracle claimed if I 'upgraded' from the Groove Isolator, as they recommended, but didn't want to pay the hefty price for the new mat and modified clamp. I thought I'd experiment with a cheaper acrylic mat first; but couldn't find one that was both 3mm thick and 289mm across. I asked an Ebay seller if he'd make one for me and woodendan was kind enough to do so. If your interested, ask him for the new size. I haven't done enough listening yet to decide on my Alex; but I love it on my Linn Basik!
http://www.ebay.com/itm/322383349483?_trksid=p2057872.m2749.l2649&ssPageName=STRK%3AMEBIDX%3AIT
http://www.ebay.com/itm/322383349483?_trksid=p2057872.m2749.l2649&ssPageName=STRK%3AMEBIDX%3AIT