b4 review -- biggest pain points?

Hi, all:

I finally have some cycles to get back to b4 development in a fuller
capacity, so I'd like to do the next iteration of b4 review and b4 bugs
features. I know some of you are using b4 review fairly regularly, while
others have tried once and decided it's not working for them.

What are the biggest pain points I should focus on? From my memory:

- I know Mark sent quite a few bug reports and from talking to him I know that
  huge series are problematic performance-wise.
- Replying and inline commenting still needs lots of polish, because it's
  deceptively like responding to email, but also not.
- Tracking series updates periodically gets wedged, but mostly with series
  that aren't using change-id's.
- I think series dependency tracking isn't working as intended, at least
  definitely not on rebased series.

What else am I missing?

-K