I just installed one of these on my A128, replacing the stock 1 1/2" drain with standard trap. I had already removed the water filter, and use an outside filter instead.
It did open up more storage space under the sink. The only disadvantage I see is that grey water will drain somewhat more slowly, due to the smaller diameter of tube (approx. 3/4") and smallish opening in the white cup under the drain - a large chuck of food or debris might be more likely to clog this drain.
If just flushing soap and water, it should not be a problem.
2015 Rockwood A128S
2010 Rockwood 2604
2014 Ford F-250 CC SB 2WD
2008 Toyota Sequoia 2WD