High volatility (but also big risk of deep retrenches). It behaves very much like HANS did about a year ago. It can have sharp drops, but the growth is so explosive and market penetration still so light, that one should expect much more from that one, if you can stomach the tail spin declines (as I said earlier today the $63/$64 area should serve as support, if that is breached, gap closing is a high likelihood.) I have built in the last week or so a nice $20 plus cushion, so my stop just under $63.5 can be "well absorbed" even if I go down with a double position.