Even streaming SD/low bandwidth content can sometimes be a bit flaky IME compared to a traditional wired connection. A wired connection is what I would always recommend for sending any sort of HD content from a laptop or desktop blu ray drive. Any so called converter box supplying a 'solution' will not be ideal since the bandwidth is still going to be an issue. You really have to spend some good money IME to get a professional wireless solution that actually works as described. Throw in the desire to actually work on the laptop at the same time and you might not be happy with the results. With the cost of standalone blu ray players hovering around $100, you would be better off IMO spending the same money on that instead. I'll also be honest- many of the positive reviews of the product you mention seem to be, should we say, a bit 'juiced' ;).
FWIW, a 720p blu ray is still very nice HD content to watch, even on a 55" display.
So I have this shiny new 55" LCD along with a shiny new enterainment PC laptop w/ bluray player and HDMI output for connecting to TV. I am researching this product: "Warpia Wireless USB Audio and Video PC to TV/Projector Display Converter Kit (HDMI + VGA)". The reviews on this are 50% good/bad. Does anyone have any information on this product or know of any other similar device that will wirelessly stream my laptop display to my TV? My main purpose for this type of device is to view Bluray movies from my Bluray drive on my laptop on my HDTV wirelessly, preferably extended display, so I can still work on my laptop while my son is watching his movies on the TV (The above mentioned product does support and actually suggests extended display). My research says this product has capabilities of only 720p (or i, I cant remember or know the difference anyway), so my concern is how much quality is reduced from a Bluray movie when dropped down to 720, assuming that the 1080 is what makes a Bluray a Bluray.