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Tohatsu makes and sells the engines to Nissan, and has been doing so for years. Nissan tends to be sold into the catalog market, such as Cabela's. The only difference between Tohatsu is the paint job.
The 30HP and less 4-strokes are made in conjunction with Mercury in the jointly owned plant with Tohatsu. All are good engines from what I have heard.

Downside is resale value, lack of readily available service in many areas, and lack of recognition by many boaters. For a few extra dollars, you can own Mercury, Yamaha or Evinrude.