Is GSAS the only effective program for large restrained inorganic Rietveld Refinements(?)
Ability to handle very large arrays not the only issue
Controllable - via a menu / scripting system amenable to scripting and automation
Large variety of restraints
Restraints can be disabled but still used for diagnostic purposes
Can easily disable/enable restraints and histograms (cyclic refinement instead of combined X-ray / Neutron refinement)