Hydrodynamic radius with dynamic light scattering?

[hudel at slac.stanford.edu]

Does any of you guys have experience with the PROTEIN SOLUTIONS
dynamic light scattering DynaPro-801?  It is advertized to measure
the hydrodynamic radius by light scattering, giving you information
of whether you have monomers or oligomers in solution.

The price seems quite steep ($24,000), but it sounds far simpler
than small angle scattering studies to determine the radius of gyration.

Hudel