I'm on my third R21EC. 🙂 They have several advantages, as Harry mentioned. I also have experience in several Ranger tugs and other trawler (and trawler like) vessels. Speed and creature comfort are personal choices. I really feel the R21EC is a tad too slow; I favor a vessel with at least 15 knot capability. But, most of my boating is on lakes and rivers where the shore is close for storm shelter;and, the river currents are slow. So, I can live with the R21EC. My R21EC has more on-board systems than my last Albin trawler and my Rosborough RF-246. Yes, it is crowded, both living space and work space. Since I usually boat alone, the living space isn't an issue. Neither, are the crowded work spaces; I've had minimum problems, none serious. Ranger does good work and provides good equipment. Hence, the price. I have a friend with a very expensive 48, or 49 foot trawler. His speed isn't much more than mine; however, maintenance has been a long term problem for him. Almost everyday, he has a system failure.
Would I switch from a R21 to a R21EC? Yes! It's worth the cost to me. However, I'd prefer a R23, or a R25SC. I'd buy either in a heartbeat, if my wife spent any significant time on a boat. It's hard for me to justify spending that money just for me. On the other hand, I've always had an expensive motorcycle (BMW) and sports car habit (Porsche and Audi; mostly used); so I might yet bite the bullet and get a R23, or a R25SC. Especially since I've given up purchasing guns (for now). My wife says she's "cheap"; it's hard for me to buy her things.
I also have 12 years of heavy, high tech maintenance training and experience, plus a life time maintaining cars and motorcycles. So, systems work doesn't bother me. But, one can expect any mechanical device to fail, or falter. Usually at the worst possible time. One should be able to maintain/repair critical items. That speaks favorably for the R21.