Let's just say, it eliminates that excuse that size matters...
I think it does as well to a certain extent: if you are stationary. However if you are always on the go and want to watch movies while walking or at starbucks or something (you know for people who would just honestly prefer something with a larger screen) then the HDMI cable will get old.
I think you should go ahead and get one and see how you like it. I LOVE MINE!
Yeah, I got mine for 6 bucks on Amazon, works like a charm. Just another "flaw" of a 7'' screen debunked when you can also view it just as easily on a 60'' screen...
I was really in two minds about this too but I'm very happy I ended up getting one. Used it just last night to show the kids some of the home videos and pictures we had taken. Used it a few weeks back on a "boys" weekend at a holiday house when I loaded up some movies and also for listening to music through the TV.
Nobody ever mentions presentation mode, I replaced my first cable after losing it just I cause missed watching videos out while surfing or whatever at the same time. Buy one.