I am interseted in buying SASW equipment. I would like to know from the users which companies manufacture this and merits of each company. If some one does not wish to post it here, they can reply to my email. It is for the purpose of soil profile to a depth of 50 m.
SASW is available from GDS in UK and from Olson Equipment in US. You can link to many sites from www.usucger.org.
Just a comment based on my experience; Buying good equipment is important of course, but reliable or accurate forward modeling software is even more important. Double check the accuracy of the software and equipment on a known site before you proceed to far. Possibly the supplier might even let you pursue this option.