I have the SDS100 and live in Berlin Camden County. In my immediate area I havent been overly impressed with performance with missed transmissions (staying on transmission frequency long after transmission ends, its inability to "find" control channels on some EDACS and Moto Type 2 systems, and choppiness on P25 especially Camden County. Outside of my home listening area there are some spots the scanner does quite well.
Camden County is about the easiest P25 system to pick up in our immediate area. I think that if youre not picking it up with other scanners that there is a chance youll hear it with the SDS100. Despite all my above complaints there are several distant systems the SDS100 picked up that no other scanner could. From within County reception on Burlington County will be ok but you may miss some transmissions (this may just be a firmware thing). I do think you'll see improvement on Philly as I certainly have.
The caveat to everything I just said (except for UHF Burlington County) is if you live within a couple hundred yards to a cell tower. That may greatly interfere with 700/800mhz reception. Although the SDS100 seems greatly improved in this area.
If you would like to meet up some time and see my SDS100 in action give me a pm. I'm frequently in the area.