tried out nightly 7.01a:

startup 20+ secs (microb and opera in no more than 2 secs)

page loading (TMO) almost twice as long as microb (microb with faster fox and speed dns add ons)

page scrolling virtually non-existent until page is ~70% done loading

obviously most add-ons will not work with nightlies

2 things in my mind going for beta/nightly: boomark sync and offline reading.

the five minute verdict, yet again: stick to microb/opera