I have the Letus and I love it. They offer a kit with the adapters specifically for the EX1, rails and case (I recommend getting the whole kit). I use it mostly for interviews, and man, it's great to finally get that truly shallow filmlike depth of field. It takes maybe and extra 15 minutes or so to set up. It costs you only about a 1/2 a stop and makes amazing images. Good luck!
Mac Pro 2.66 - 8GB memory - Mac OS 10.5.5 - Quicktime 7.5.5 -
Mac Book Pro 2.33 Duo -
FC Studio 2 (Final Cut 6.0.4) - Kona Lhe
Adobe Production Suite CS3 -
Sony Multiformat 14" - Panasonic 42" Plasma -
Ikegami HLDV7 - PVW EX-1
But I'm happy to answer any questions you might have.
Sony EX3, Letus Ultimate, Nikon lenses, Sachtler tripod
20 years as a videographer/editor - HD and 35mm adaptor newbie
Experienced with Apple products, Final Cut Studio, Adobe Creative Suite, MOTU Digital Performer, Flip4Mac, etc...