Here are my thoughts based on 400 hours at the helm of my R21-EC.
Like you, I have owned many different boats, and piloted even more: I have owned a Fisher Marine with a 35hp Merc, Regal 23' with a Mercruiser 350, Regal 21 with the 4.6L, a SeaRay 190 also with the 4.3L, and a SeaDoo Islandia with the 250 M2 jet drive. I have skippered, professionally, a 60' harbor cruise boat (100 ton) with twin Yanmars and Hamilton jet drives, ferried a handful of amazing craft, and crew on a C&C racer/cruiser as the main sail trimmer.
In my experience, I have gone really fast, and in sailing, relatively slow.
I currently live on the river just north of downtown Tampa and keep my 2015 21-EC on a lift in my backyard. The Volvo Penta D1-30 was replaced by the previous owner, courtesy of the recall in mid 2018.
I bought her with 25 hours on her in March of this year. I'll be doing the 400 hour service after the Christmas Parade with about 405 hours on the meter.
So my thoughts: Everyone loves the look of the boat - be prepared to chat with people when you are tied up at any marina, restaurant, anchorage or tiki bar. The fuel consumption is strikingly low. I average 16 m.p.g. per tank. She tracks like an arrow - if there is constant wind and current, you only need to lay a finger on the wheel to make a minor adjustments every minute or so - at any speed. LOVE that 2' keel, & inboard drive! She has just about every feature one could want in a small inland boat.
My thoughts that could be a negative, depending on your situation: She is slow. At 2/3 throttle, 2000 RPM, you are looking at 6MPH. (I use MPH on my GPS for a handful of personal reasons.) At 2500RPM you will see a bowrise, a proud wake, and an increase in speed to 7.5MPH. At wide open, 3000RPM you will squat in the water and make 8-9MPH, and attract dolphins and jetskiers who want to play in your wake. She does have a narrow beam, 7', I believe, so waves or wakes taken abeam will give you a good rock. Also any passengers moving about will cause a list and need a correction in the rudder to track on course. The wonderful deadrise on the bow section slices through 2' seas like a champ, and 3' rollers with only minimal lift.
Now living on a river, and mainly harbor cruising, much of the area a travel is limited to "minimum wake" and makes this the perfect boat. But if you are looking to get to a destination over the horizon, it will take some time. What's that saying: "It's the journey, not the destination?" This boat exemplifies that concept. During the journey you may very well enjoy A/C in the summer, heat in the winter, a cool bevy from the fridge, and windshield wipers when a storm pops up, all while underway.
I know this is many thoughts, using many words. I can get specific if you ask.