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We bought and installed HP beta 4. It worked fine and we were initially very impressed - it got us up and running fast. Modifications were difficult due to the complete lack of documentation and the forum is helpful only if you have hours to wade through red herrings. We reached a critical point after uploading 350 or so properties - editing of properties doesnt work after a certain critical mass - a known problem which was not mentioned when we bought, of course.
We were told to upgrade, which was a very dodgy and worrying process which threw up several issues - not least the loss of all modifications we had made to the underlying code (this is unfortunate but understandable). However, having done the upgrade, we find the search facility (fundamental functionality for a property sales site) for RC1 (latest release) doesnt work and hasnt for two months or more. Feedback on a fix is ZERO and, of course, documentation is also zero.
If they get their act together, they have a GREAT extension which WAS well worth the money, but there is a definite feeling of walking a tightrope with these guys and support gives you the feeling of walking through a midwestern ghost town - tumbleweed and all.