I tried a Bose L1 model II system yesterday!
I was at a music university to do a live looping and Stick clinic yesterday and the theater they scheduled me at had a Bose L1 model II system with two towers and one bass module. I had brought my SG12 and played with my normal laptop rig's stereo output with the two Bose towers as left vs right channel speaker. I did not like the sound at all. This system sounded too thin in the mid frequencies and the SG12's distinct and snappy PASV tone felt too "hard and metallic". The low end was fine though. I'm sorry I did not bring my Grand as well because the Grand's PASV tone is warmer by default (but "slower" and more "clunky" sounding).
For some time I've been interested in a Bose system for future Stick amplification but after yesterday's experience I know that Bose is not for me
I have set up and trimmed my SG12 sound on fairly transparent Genelec studio monitors, so I'm pretty sure now about what coloring of the sound to expect from a Bose.
For reference, some live videos that display my normal "non Bose-fied" SG12 sound:
http://www.youtube.com/user/perboysen