There have been a few reports on AVForums of these.
Mostly rubbish.
If it’s just for powererpoint-type use, then I would get a mega-bright cheap second hand unit.
The one you linked to is only 640×480. That’s the resolution of Safe Mode, so it will look pretty terrible for the computer desktop.
I’d look for 1024×768 as a minimum, but obviously widescreen is more in tune with current laptops, etc.
There are loads of business/data projectors going cheap on ebay. It’s the home cinema ones that command the premium.
The bulbs are the potential expense – either get one what says it’s a new bulb, where cheap replacements are available, or one that will give you a 3 month warranty on the bulb.
HTH