I don't have any experience with flycraft, but I have decades of experience fly fishing out of rafts. I went and looked at their website and the stealth model and noticed a couple of things.
I don't know if you will be fly fishing, The advantage of being able to stand in a raft in fly fishing is that it gets your rod tip 6' to 8' higher above the water than in a float tube. Gives you many more options in how and where (and what) you can cast. But when you stand and cast, having a broad base, as in being able to spread your feet, allows you to properly control everything. The stealth on the website is pretty damn narrow, and precludes a wide stance. It's narrowness is also an issue in seaworthiness , wether floating a river or being offshore. You're out there to fish, not worry about your craft.
I think for what you pay and what you get, you can do better. A wider inflatable is cheaper. You can build your own frame with floor for a couple hundred bucks, and you will have something that you will be able to use in more situations.