Bottom Line - This projector is a truly impressive achievement. Although only 3500 lumens compared to its big brother's (PT-D5500u) 5000 lumens, and lacking the dual amp design, it costs half as much, and is priced to compete with the better LCD projectors out there. Of course as a DLP projector pixels are far less visible, a plus for some applications. Certainly there are much less expensive projectors in the 3500 - 4500 lumen catagory that also offer interchangeable lenses.
Few of those however can match the versatility of this Panasonic. The advantages of a DLP powered projector may be what sets the PT-D3500u projector apart. While it rivals LCD projectors in terms of color handling and sharpness on data, it does outperform the LCD projectors as a class, on video.
I would say that this Panasonic projector is ideal for command and control, scientific, medical imaging, engineering, and any other applications that are image quality and detail critical, and that can be handled by an XGA resolution projector. The compression technology Panasonic has built in lets it handle higher resolution sources almost effortlessly, so that despite being "only" XGA native, it might prove to be an excellent lower cost solution for some applications normally demanding an SXGA or SXGA+ projector.
Last comment. I watched parts of several movies, and some Hi-Def content, and this projector is that good. While it won't match the best of the dedicated single chip DLP Home Theater projectors, it is several times as bright, and would double very nicely in a family room environment, where the room has moderate to low (instead of near pitch black) lighting.
This projector earns its Hot Product Award for basically, being good at just about everything, and great at image quality.