Kolibri KM-420CM (13'9") inflatable catamaran

I recently got my KM-420CM catamaran from Kolibri Marine up in Canada.  Basically, the boat does what I need it to do.  I bought it for it being light weight, portable on shore, load carrying capacity, HP rating and the flat front end.
We used it this summer as we explored northern Michigan with it.  Starting in Munising, we went west to paradise (point), out to Grand Island and East almost to Miners castle.  We had between 3 and 6 people on board during these trips and it always felt stable.  Also ran it on Glen Lake (3 mile diameter), lake Michigan out of empire and floated the Platte river in it.  We only used it for that one vacation, having inflated it three times so far and putting over 50 miles on it in Superior, about 7 in lake Michigan and over 10 on Glen lake.  I need to use it more to gain operating skill, play with props and proper loading and possibly add a bimini top.  Not sure, but I expect to get a lot of use out of this thing.  
Flat front:  the kids love the flat front for getting on board from the beach or climbing out of the water.  It is very difficult to get on over the sides, but the front is very doable.  Not easy, but possible.  Loading from the front does cause a bit of water to get in between the air floor and the vinyl bottom, which really doesn't seem like a problem until you try to go.  That is a lot of weight to push and it changes the shape of the floor leading to more cavitation.  But the transom drain did its job over several minutes and when I noticed the lack of water splashing around by the transom, the boat jumped up on plane.  The flat front also made it nice for exploring the rocks and caverns around Lake superior.  Even with a mild wave swell, it is easy to slowly come up to a rock face, have the bow touch off and a person depart the boat easily.  That action pushes the boat back to allow the next person to get ready and repeat.  Loading is done the same way, just have them be patient.  Sitting on the front as you row into shallow water also allowed them to simply hop off when the water was shallow enough.  Gave us a lot of confidence to explore into the rocks and sea caverns when I wouldn't feel safe taking a fiberglass boat up to.
Oars:  Kind of a "it meets the requirements" aspect.  The oars work, but are too short for any extended work. But they work when you are drifting around in a sea cave on Lake Superior and you want them short!  So cool.  Plus they come off easy so one person on each side can use them for testing depth, pushing off of rocks or moving.  Not great, but more useful than I thought they would be.  Really, handle extensions or clip-in extensions could be made and would make a big improvement while keeping the versatility of shorter paddles.
Air floor:  I am used to SUP's with a pressure of 12-15 psi, so the air floor being at 8 psi (9psi max) feels really soft.  When going over waves it moves up and down and flexes quite a bit.  It probably helps a lot with the ride, but I think it is one thing that adds to the prop wanting to cavitate.  At one point, I had an adult child sitting on the floor and I noticed that it changed how the boat planed and how the propeller bit the water.  Something to keep in mind, but the air floor itself worked really well.
Motoring:  I put a 20HP Suzuki 4 stroke on ours and I think it is too much power.  tuck the motor in and it wants to lift the stern out of the water.  Kick it out and it works well.  With 2-3 people (550 lbs) it jumps up on plane and does really well from 15 to 20 mph.  Not a bad ride, throttle about half way.  giving it more throttle and it gets squirrely or cavitates.  I have not played with a stainless prop and pitching it yet, as this seems important to this style of boat.  Not sure how I would feel in this going more than 20 mph.  Now this is on larger lakes with at least a 1-2 foot swell / waves.  A smaller lake or river might be different. With five of us, (Mom and Dad in back, three kids 11-14 on front seat / floor, about 800 lbs plus some gear) the boat planed well and scooted along.  Adding one more 20 year old daughter pushed us close to 1,000 pounds and I just couldn't get it up on plane in the 1-2 waves we were dealing with.  A different prop might have worked, but we plowed along at 7-9 mph no problem.
Floating: floated the Platte river and it did well.  Loaded with people, it still has very little draft so it just floats over what a SUP fin will stop on.  Rowing across a lake was difficult with the oars, as mentioned above.  A little 30lb trolling motor would have changed things dramatically!  But it had pretty good control floating down the river, only real problem was with wind as it wanted to push the front around.
Setup:  Setup is really easy after a few times.  I use a high volume inflator and it quickly fills the five chambers and allows everything to be fit.  Then throw the electric SUP pump on it to 3.0 psi (playing it safe) and let in finish it off.  Goes really quick...