Got the RB Streamer 5er on a whim, as I've never owned a 5 before. HUGE sound on this on as well, even with the stock rounds. Initial playability was pretty good, but a $45 setup 'n level pushed it over the top. The RB series is not considered to be "cool," but is truly astounding for a mass-produced, under $1k bass. Seriously underrated in my book
I still prefer four-bangers, though. If you were in my general vicinity I'd consider swapping.