To set the record straight the Mekong Navigator is owned by and operated by Haimark Ltd located in Colorado with luxury river boats in Southeast Asia. The very good to travel with, Lueftner Cruisers, from Austria, with their excellent European river boats, does not own the Mekong Navigator but, instead, represents Haimark in Europe. You can look it up.
We're river cruisers and have a few under our belts. We rode the Mekong Navigator in December, 2014 as part of a very good 17 day Gate 1 Travel trip through Vietnam and Cambodia with a 2 day extension in Bangkok. We met the river boat at My Tho in the Mekong Delta after a roughly 2 hour drive from Saigon (as the locals insist on calling it). We understand that the Mekong Navigator is a new boat in late 2014 and it is quite luxurious with an outstanding crew especially the folks you interact with the most (dining room, bar staff and butlers...yes, butlers, but not for all of us...just the suites). We were told that they are all Cambodians with good english for us foreign-language-challenged Americans and good memories because they remember your names.
The cabins are spacious and well appointed. I really like the cabins on the Lueftner boats in Europe and these, to my taste (not my wife's), seemed a bit much. You can judge. Very good, large bed. Fancy bathroom, shower, no tub unless you book a suite. French balcony, unless you book a suite. Plenty of window. Good a/c and ceiling fan. Bottled water provided. There could have been more drawer space for some, but we managed quite well.