Thanks, callmeed.
1. Yep, slider implementation is jQuery UI.
2. It is too early to tell, but we're definitely planning to share a follow up. As mentioned in the post, we had a simple thumbs up/down for ratings and were seeing a greater than 90% positive average, so we were definitely experiencing that bias. Just today, albeit with a much too small sample size, we're starting to see a more diverse mix of averages. We still expect to have that positive skew but because we're now operating with a 100 point scale in the UI, we hope the granularity will help users distinguish subtler differences in rating.