Outside of the defective cable, my guess* is that it will be more of a lateral move than an upgrade. I'd instead consider a pair of powered studio monitors, for instance. Or, if you can muster an amp, then passives of course. You probably can't implement the sub, at least without hi level I/O and onboard BM, which I'm sure is not available at the price point.
The Cambridge looks to be about $200, and I understand that my recommended path is perhaps 3-fold in price. But, you can add a sub later down the road, and I think the results should be at least 3-fold in performance.
Otherwise, I'm not sure if you'll find anyone who has compared these two products.
