I started having issues with my clicker this weekend. Sometimes when I click it - it doesn't turn on and sometimes it doesn't turn off. Also, I hold it similar to how I hold a pencil and use my pointer finger to click and the sideways pressure can sometimes turn it off and on without clicking...
I got my hopper yesterday. I can confirm the batteries are GHB2. My unit had a lot of gunk inside as well so I definitely recommend a good cleaning before use. I have had no issues and I am definitely in honeymoon phase right now.
I am pretty sure they are not on track. I am a January '16 preorder with a June estimate. I don't believe they will make it through 6 months of preorders In the next week.