The XMRV test offered by VIP Diagnostics is basically a second generation test - the one where the Whittemore Peterson Institute announced that almost all ME/CFS patients were positive for XMRV, compared to the test at press time where only 67% tested positive. The test is by no means perfect, and it is not yet clinically validated. For persons who have severe disability, it's better than what they had before. It's pretty impressive to go from 67% accuracy to 97% in such a short period of time - it is more accurate than current tests for lyme disease.
It takes a considerable amount of research to refine testing methods, some of which involves making DNA primers with higher stringency. It also involves standardizing the test amoung several research institutions. Blood banks will usually want a clinically validated test. If you get tested today, there is still a small chance the test may not detect anything. If you are willing to part with you money, it may provide some answers, however it might be better to wait until a clinically validated test is available.