I have a 62" LX (and a set of XR limbs as well). My LX works well for me at 7 1/4", but that's a little below the recommended brace height. Below is a copy from the old RER web site when Kevin was making them.
"Brace Height Recommendations
Good Starting Points +/- 1/4"
Longbows
58" Vortex II 7-1/4"
60" Vortex II 7-1/2"
62" Vortex II 7-3/4"
64" Vortex II 7-7/8"
58" CLX 7-1/2"
60" CLX or LX 7-5/8"
62" CLX or LX 7-3/4"
64" LX 7-7/8"
Recurves
58" Vital 7-3/4"
60" Vital 7-7/8"
62" Vital 8"
64" Vital 8-1/8"
56" CXR 7-1/2"
58" CXR or XR 7-5/8"
60" CXR or XR 7-3/4"
62" CXR or XR 7-7/8"
64" XR 8"
One Piece Recurves
54" Arroyo 7-1/2"
58" Arroyo 7-3/4"
60" Arroyo 8"
62" Arroyo 8-1/8"
54" Retro 7-5/8"
58" Retro 7-3/4"
62" Retro 7-7/8"