I am upgrading to it later this month. I currently have an Infocus ScreenPlay 4805. The nice features that VLP HS-51 is that its display is native 720p (no scaling necessary for 720p signals). It also has an amazing contrast ratio due to its use of a dynamic iris that restricts the light based on the scene. For anything related to front projection, go here:
http://www.projectorcentral.com/
They have tons of reviews & a huge database of projector information. As you can see from their charts, the hs51 is the best bang for your buck in its price range. It really took the spotlight at this years Consumer Electronics Show. Before this guy, LCD projectors in this price range couldn't compete with the contrast ratios of the DLP projectors. It not only competes, but beats them 
ps - if you are a techie, its also nice to know that the hs51 has a serial interface (rs232) & you can write a computer client program to communicate with it & control all its settings. Much like those touch panel displays that home-theater companies like to put in.