I was curious about my bass, and I found this place and this thread on Google. Let me talk about my experience.
I have a University Grade in Bass playing (around 13 years of studies), and I played with the National Symphony Orchestra in Costa Rica in the 80s, although later I changed my orientation to informatics.
I know many different basses, from the sublime to the profane, including carved and laminated instruments, concert, orchestra and jazz style ones. For many years I was out of practice because I didn't have an instrument and I was pursuing my computing career very hard, but later I realised I needed to have "something" at hand to recover part of my art. You know, a bass player always will be a bass player.
Then, I found in EBAY an instrument. In that moment I was out of money, so as cheaper (with obvious restrictions), the better. Also, I am located in Costa Rica, so transportation is an issue. The bass was a Prima P-98 instrument.
It arrived in a weak cardboard and within a nylon case and having a bow. I supposed it was broken inside, but was in one piece. The strings were ... how to say, a piece of crap. I never saw so terrible strings in my life from any brand. And the Bow is nice looking but just that; I suppose cost $25 the most. The varnish had some issues but was, in overall ok. And the Fingerboard was "different" than the standard black one. $800 the instrument, $100 transportation by sea, $100 taxes (more or less) ... still useless instrument.
I know what I do with my bass, so I purchased a new set of Pirastro Obligato strings, adjusted the bridge, and never used the Prima bow but my Schicker 25 years bow that cost several times the bass itself.
With some training time, to recover my skills and to let the instrument to be accustomed to me and the new elements, the 4/4 Bass started to show its real soul. It still needs Fingerboard adjustments, although I can live with the gizz the G string produces (this seems to be a standard problem), but when you know how to manage a Bass, the P-98 is a wonderful, powerful, and extremely sweet instrument. The 4/4 box has very good resonance, particularly when playing the four seasons with a chamber orchestra in a good theater.
It is not perfect, but many depends on you, not in the Bass itself. If you know what to adjust and you learn to drive it, the P-98 is a very good instrument. I still have it and will have for many more years... oh, this bass came to my hands 15 years ago, and the Fingerboard is the "best" part of the instrument ... it is, some way, soft and gentle with your fingers, letting you to communicate better with the instrument, something I didn't feel before with instruments costing more than $20000.
In general : I recommend the instrument, but it must be adjusted first to acquire its potential. If you can't adjust it or to afford a Luthier to do the job, better try another alternative. Oh yes, and I live in an extremely humid tropical country and this instrument works here as in its paradise.