i had an old-model bitscope, which came with crappy
software. i recently got an upgrade to a more modern
one, and it seems to work with the newer software now.
the limited serial port speed is definitely an issue, i haven't
found a good high speed usb<->serial interface that will
work with it.

there are some primitive python wrapper libraries for the
bitscope protocol, could be a good base for any kind of
interesting logging.

so the bitscope looks pretty nice to me at this point, but
i haven't been doing much tronix since i got the upgrade
so i can't give a definitive review. it's borrowable if you
want to play with it.