How much of an improvement is this over say a 2017 4 stroke Merc? What are the pros and cons of this new engine? I am looking at staying with the 150 or 175, but have to check $, its $500 difference comparing 150 vs Pro XS, and $2500 more for the 175 I feel that out of line price wise. This would be on a Ranger 1850 MS or Ranger 1880 Angler, will not jump up to 200, its at least $4 grand more. Appreciate and thoughts on this engine. Will not buy until summer of 2019 or fall of 2019. I have a 150 4 stoke Yamaha on my 2012 Ranger 1850 RS and I am happy with the 150.