SL1 Stereo upgrade

i own a 99 SL1.....and am going to upgrade the stereo...has anyone here heard of elemental designs?? alot of people talk about them on some of the forums.....just wondering if anyone here did this is there website http://www.edesignaudio.com/ stuff looks very nice...and i love how they do the box blueprints.....just want to know if anyone here has looked into them or is running there stuff...thanks !