Never owned a Merc but have owned many 2 and 4 stroke Yamahas, a few 4 stroke Hondas, and a first-gen E-Tec. I sold my last Honda and I now have three seasons on a Suzuki DF300.
If the prop blades weren't so sharp, I'd take that motor to bed with me. It has run like a sewing machine since the day I hung it---never thrown a code, never uttered a peep---it just runs and runs. Fluid and filter changes are a piece of cake and it sure is nice to be able to get at the internal zincs to check on corrosion in the cooling ports
They are a bit touchy getting propped right, and they need to be hung properly to make use of all the power and fuel efficiency but once they're dialed in, you tend to forget all the other reliable motors you've owned in your past
Next step for me---the DF350-----nothing but rave reviews so far for the new addition to the Suzuki fleet