I don't see what the advantage is, but I do see some disadvantages. Besides the cost and size, it's noisy! You've got to use batteries, which aren't cheap and aren't good for the environment.
And what the heck do you do with the pins as you sew and remove them? Lay them on that oh-so-convenient paper funnel next to your already crowded workspace until you've got a pile of them and then load them back into the barrel?
Honestly, I am a gadget lover, sewing and in the kitchen. But I just don't see any positives for this thing.