I love the Instax cameras even though I have six or 7 Polaroids (Land Cameras, SX-70 and a One Step 600). I like it because it's super inepensive and like you said, you can shoot and hand someone a shot and not feel like you've lost anything.
I've taken mine out to the park or river when shooting film and shot strangers with their permission and handed them the shot after.
I was looking at the 210 myself since I shoot the larger peel format and 600 series instants. I have an older Polaroid PIC-300 which uses the Instax smaller format, and then on a whim (and when it was on sale on top of a sale) I got the imported Fuji Instax Mini 90. Loving it, but still want the wide too. Fun stuff these.