Could be due to general load issues right now but at one point I was taking pictures on the ipad when someone was testing out the iphone 4s. Both are on the same wireless network which has a 10 mbit upload connection. I'll take a picture, see it copied into photo stream within a minute or so but then I may or may not ever see it on the other device. Don't get any messages about not being able to send it either. Not a huge deal really but wondering if anyone else has been noticing this.