One thing I do like about it is that entering text in fields is much quicker than on MicroB. For example, when entering text into the box to post to this forum, MicroB is a little laggy whereas Firefox isn't. The fit to zoom when you double tap also seems a bit better on Firefox and I do like the left/right swipes to bookmark/see tabs.

On the other hand it is slow rendering pages, the sensitivity is a bit wonky (sometimes it seems to just open links when my finger was nowhere near it) and the way the bookmarks are arranged is a little confusing. But overall, really not bad, I can see me using this for forums where I frequently post.