We have a set of MEDx/SPM/Matlab users and some AFNI users. Believe it or not, we have some uses who do some processing, on a single study, using both sets of tools thanks to the ability of AFNI to read in .hdr/.img files. 3dvolreg is definately faster than AIR3 but we still bog down due to study sizes.
Given the access to AFNI source, its the logical candidate for parallelization.
Otherwise we have to deal with a corporations, licensing issues etc, etc.
Having deconvolution in the realtime plugin would be a great step!
Dave