We replaced our original system last spring with a Sealand Domestic VacuFlush with a 45 gallon V holding tank and couldn't be happier. Yes it is expensive ($2000) but we have no smell, my wife is happy (even shows friends our feature toilet) and we have been living abord for the last 3 weeks without needing a pumpout yet (60% full as of this morning). We do follow the rule 'If it is yellow let it mellow but brown we flush down". When we pumpout the system leaves only a cup or so of fluid in the tank not like the original tnk that never pumped bellow about 20%. All the tank fittings are on the top of the tank so no possibility of leaky fittings.
I have documented the install and will post it later this week.