There's a review of the predecessor, the CUBE-100 bass linked above.
I'd say it's a huge improvement on what you have now, the only reservation is that it's probably more than you need. They seem to go through the Bay occasionally for around the £120 mark second-hand so I wouldn't want to pay much more than that.
In my experience Roland gear is high-quality and good value for what it costs. I have an amp (not this one), a piano and an accordion and all have given years of service.