yeah i have the sling av, had it for 3 years now but been thinking about getting the hava hd streamer, it has built in wifi and the hd version streams hd over the net plus two ppl can view at the same time, one on the local network and one over the net. Dont get me wrong, i also have a sling catcher which is terrific and i think its finally paid for itself by now but i want hd capabilities over the net and cheaper.
The Hava devices are the only ones I haven't tried yet! I want to use them too for the reasons you stated but I cannot find them for a reasonably price. The slingbox I installed in San Antonio and the LocationFree device I use for local streaming. I can watch tv on my PSP and share my home cable tv. The Hava would be sweet for that multicasting aspect, but I can't see really using it often. I would maybe put a sports game on all the computers or something, but I'm the only one who cares so I won't spend more than $50 or $60 for it. I only got the LocationFree to screw around with because it was $30 on eBay......