Black stuff coming out around cap, stained hand (ink?)-- maybe faulty unit...
Cool product, but unfortunately it appears I got a faulty one.  Upon receipt, the packaging appeared fine (no damage).  However, upon opening the box and using it, I noticed a relatively large air bubble trapping a good amount of the ferrofluid. After touching near the cap, I noticed it had stained my hand black (not a little, like half my hand). The ink(?) was very difficult to remove from my skin and still is not completely gone.  Disappointing. Glad I checked it out before gifting it...<br />UPDATE:. Got a second one, and this one has faulty magnets (it's weird like they forgot to glue the buttons onto the plastic so they came straight out of their handles when first removed)- so thats 0/2 items which arrived fully functional. Item box was damaged on this second one too- bad product or bad stock. Updated to 1 star.
Rating: 2 stars