Another Northstar, another Cassette. Here in europe, fixed black water tanks are an exception - cassettes are the norm.
+ Dump almost anywhere
+ possibility to use the cassette without tank deodorant/chemicals, SOG* vent system
- 2 days capacity for 2 people
- no full hookup; you always need to dump and rinse the cassette
(actually, we dump more often, as an half-empty cassette is easier to carry and wheel around)
*the SOG is a small electric fan that connects to the tank vent via a hose and is activated when you flush. It works very well in keeping odours out of the bathroom. We used one in our previous Outfitter camper. Currently we just dump and rinse daily, that works well without chemistry.