Hi, the concerns you might have, if I were to venture a guess, are how well they are built, economy of operation, quality of added parts, speed and performance in weather?
Construction: They are very very very well built and you have an amazing resource in the Ranger Tug Service Dept, as well as an nearly unlimited group of people on Tugnuts that have great advice, a helping hand if needed and a ton of experience.
Economy: If you keep your speeds to trawler speeds, the economy of operations are astonishingly low compared to "speed boats". If you intend to do most of your cruising in the Pacific NW, you will get to know the tides and current well and use them to further your economy wherever you can.
Added parts:Our tug has a Garmin electronics package and we are very happy with it. The stove, lights, and all other equipment added are of nice quality and work well within the boat systems.
Speed. We go slow, and enjoy the trip. We can squeeze 15+ knots our of 'er, but we mostly run around 6-8 knots and enjoy the ride.
Weather: We have crossed the straights in 4 foot chop, and our tug (an R27) was not phased. With a draft just over 2', the boats handle really well in a following sea also, which impressed me.
I hope you find a perfect tug, I am certain one is out there for you. Rangers are great.
Jeff and Ela, Bobolink R27.