The speed is apparently within a few percent of a SA RPC - this isn't terribly surprising for reasons I won't go into here. The fact that it emulates a 710 system is perhaps confusing in terms of speed. I only poked a machine very briefly, so can't make any subjective comments about it.
The laptop itself is a generic PC laptop, which is noisy (big fan), and battery is just over an hour. ugh.
It's "still" Virtual Acorn. No networking support (unless you access WinXP network filesystems, etc).