I've got a line on (what I think) is a good deal for a new (still in the box) 98 Mariner 4 stroke 15. My question is, how good is this engine? Since this model has been out for 3 years, I figure there's some good data out there. I'm upgrading from an Evinrude 9.9 2 stroke that finally bit the dust after 36 years.