hi, I have the older Sony GFD-G55 and recently bought a new CFD-G700CP. If you are after good sound and don't care about the larger size dimensions, then for sure get the Sony CFD-G700CP. Looks like Sony lowered the price to $99.95 list now so it is an even better buy than it was before!
The bass is very much improved over the older models as is the highs.
The CFD-G700CP does indeed pump out the bass and at decently loud volumes too.
The sound from CD's and Radio stations is very natural sounding and not boomy nor colored for the most part.
The older previous models seem to distory on deep bass when played loud, but this newer CFD-G700CP model does not distort nor rattle. You will be happy with the sound.
But be warned, it does not have a backlit LCD display and it is a small display hard to view without a flash light shining on it.
They also did away with the number buttons on the remote control (another negative in my opinion).
But you can't beat the sound this unit is capable of pumping out especially at this price point.
If you don't mind the bizarre looks of these Sony Xplod units, then I highly recommend it. Go for the CFD-G700CP.