I had a used Messenger DLX with the 41.5" scale. It was a wonderful instrument, the main reason I sold it was that I could not get it to fit into the trunk of my car. I do a lot of city gigs and often find myself bringing the BG instead of DB because I can lock the whole rig in my trunk and go get a bite to eat or run errands before the gig. I am not comfortable leaving my DB in the front seat (for obvious reasons)! The Messenger fit with maybe 1/16" to spare and precluded storing my amp in the trunk too.
I actually sold the bass back to John Knutson himself. I live about 2 hours away from his shop. I brought it in for some adjustments and he offered to buy it from me on the spot for $50 more than I paid for it! As I am getting married and planning a move soon I figured I could use the money.
While no EUB can really nail the full DB sound/vibe, I was impressed with the workmanship, playability, and sound of the Messenger. In particular, the dual pickup scheme is brilliant; the phase cancellation between the two pickups allows you to set a blend that will work great for pizz and arco with no on-the-fly twiddling. I wasn't trying to clone a DB sound; in fact much of the time I used the Messenger into a variety of distortion, flanger, octave, and envelope filter FX. Especially arco, I got some crazy sounds.
I had Thomastik SuperFlexibles and then Pirastro Obligatos on mine. The Obligatos made it sound like a big fretless BG while the SFs were more DB-like for both pizz/arco. Always sounded great into GK, Eden, and EA amps plus Bergantino/EA cabs. I would definitely consider buying another Messenger (maybe a 5 string) if I need an EUB in the future.