We use mob fox as an Ad server but also have used it for other purposes like reporting etc so I can't say if its best at one thing or another - however we are able to get our ads served very quickly which has been great! There was no way that i could find out how many impressions were being seen by my clients campaigns until after 1 week had passed when reports came through from them (which meant getting up early!).
This would be useful information sooner rather than later though maybe this isn;t something you expect? If your looking into using MOBFOX then make sure there's someone who knows what they're doing available during set ups/migrations otherwise things will take longer than needed and more likely not work properly once setup anyway. Faster turnaround times means faster revenue generation meaning happier customers = happy me!!