I bought this module and whilst working with Joomla 1.7 and Virtuemart 2, (all still very new) I experienced problems with the search plugin as supplied. I contacted Offlajn (Roland) and within 24 hours got response back. Because I worked on localhost it was not possible to share via url, so Roland logged into my computer via sharing software and within 15 minutes resolved the problem. Excellent service!!
Now my search works lightning fast and better than expected.