Last week, I picked up a used Rumble 1x15 cabinet, to go with my 500 v.3 head.
At home and at a gig, I was underwhelmed by the sound-- to me, it didn't quite have the guts of my GK 210RBH or Neo 112II or Neo 212II cabinets.
I
am familiar with single 15 cabinets-- I use an Ampeg Rocketbass combo quite a bit (especially for quick tear-downs at multi-band shows with FOH support), and I used to play through Music Man 1x15 cabs and homemade 1x15 Thiele cabs.
Anyway... after the gig, I got the most compliments I've gotten in recent memory.
As Kurt Vonnegut used to say, "And so it goes..."