I think the trade-off is mainly for dry camping. With a normal RV toilet, you would have to have fresh water for each and every flush. It normally takes between .5 and 1 gallon per flush. With the TM toilet you put in I think it is three gallons initial charge and then use it until time to dump. For the wife and I that is normally almost 3 days.
There was one thread where someone replace the TM toilet with a normal RV toilet. He said he did not dry camp and that he would not camp at a campground without hookups. I personally am not will to give up that option.
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