It's a matter of preference, not an affection.
I prefer writing things down by hand because I remember them better that way, and if I don't, well, it's in my notebook. I tried switching to my iphone for a while for my schedule and my shopping lists, but though I liked the compactness of it, for me the additional complications outweighed the benefits, and I wound up going back to the old fashioned way.
And yes, it's perfectly practical. Companies with more than two people have existed for quite some time.
I wouldn't get one of these without having a chance to actually examine one, though. $25 is a lot to spend on something like this without getting a feel for it.