Not sure if a response is useful to anyone following the thread... I have an RJ 1X15" with a Little Mark III--I lucked into separately find each part used, and I love it. With a gig bag over my shoulder I can pick up the rig in two hands and walk in the door.
The sound is full and can be tweaked a good bit. I mostly play an SVT/Fliptop sort of tone but occasionally roll up the treble pickup and tone on my Jazz and do some popping. The amp seems to follow the bass tone changes well. I'm not a "princess and the pea" sort of gear hound (life's too freakin' short) but do require a good warm tone. In the past I've had SVT heady & cab, GK400RB, Hartke cab, Bassman 2x12, and Mesa Boogie 2x15 cab. I love this rig, and am now a Markbass convert.