I know you already purchased your boat, but I thought I'd throw my 2 cents in. I'll also preface this by saying I'm particularly biased so probably disregard anything I say ... but I really like Water Master rafts. I own 2 grizzlies, kodiak, and the bruin. I do some video work for them so I did get the Kodiak for free and a steep discount off of the Bruin and a friend gave me an old grizzly.
My buddy has been using the outcast boats and they are solid boats. But there are few things I've noticed I don't like:
1. The commander sits really low in the water, so you end up being kinda wet all day, which on a cold day makes you even colder.
2. The clearwater sits really high, which means your feet don't seem to have good purchase in the water (maybe it's me with my short legs).
3. On both boats, I'm not a fan of the inflated sitting area, I like a nice solid hard surface of the WM. I feel like it ends up stressing my back a little bit more.
4. On the clearwater, get some oar holders, I find that there isn't an easy to way to store the oars while floating that don't get in the way (criss cross across your lap), and if you let go accidentally they will definitely fall straight down.
5. The outcasts boats do such a better job with integrating accessories than the WM. I like that they include several spots that you can attach plates to for scotty holders.
For the water masters
1. I do like how compact they roll up, even the bruin is pretty compact and I can fit the frame and boat inside my minivan. I feel like not having a frame on the smaller boats.
2. For a single, I absolutely love being able to stand up with the boat around me. The outcast boats and the WM both have this in common. It allows you to just stand and fish, which means you can work a run and then just sit and go. Or sometimes if I want to wade out somewhere a bit deeper, I've got my tube around me allowing me to safely push the limit a little.
3. If I want a floor I can always buy the floor, though I know it's not cheap.
4. I do wish they had some more attachment points for rod holders. I use the scotty float tube rod holders, which will hold up to small trout spey rods (barely, I have to kind wedge it into the holder).
5. I'm not such a fan of the foot rest, the strap works and the newer one seems even more durable than the old webbing ones they sold.6. I also like that the boats include drinks for a front handle. I use a rope on my grizzly, and the kodiak came with the handles.
7. I really like how the oars fold in AND there are straps that you can use to keep them from slipping off if you want to use them.
8. While the Pin style oarlocks are great for beginners, I do worry about them catching a crab and breaking on a trip. But you also get a nice way to fold them in. I really should have a backup one as part of my emergency kit.

I do like the frame on your boat, that's pretty sweet, though I would feel completely comfortable taking my WM down through class III water.