We have a Sea Eagle, too. I bought the smaller one that is made for 1 or 2 persons (SE 330) and find that it useful mainly for beach purposes. I think it works only if you are ok with getting wet. It's fun for us to paddle it alone. It's way too much work for us to use tandem, so it is just very basic transportation for getting us to the beach with a swim suit on. First of all, I have to get my body low enough to get into it without flipping over. That means I have to get my feet in the water while standing on the ladder to sit in the kayak while it is stable enough. Then, we have to beach it to get out. That means wading in the water because you can't paddle it far enough on land to get out on land. There is no way we're getting in and out at a dock or from the boat without standing on a lower rung on the ladder.
It is very slow paddling when 2 are in it and it really only works when Sue is in front with her back against the bow. No matter how I do it, water is getting in the kayak from the paddles when I'm paddling. That means that we are eventually sitting in water. The seat keeps you higher and dryer, but still it's a wet process. With regard to the seat, I find that if I blow it up too firm, I am sitting nice and high. But the higher I sit, the less stable the kayak becomes, but you get used to it. I find that if I only half-inflate the seat, it is comfortable and the kayak seems far more stable. If I am paddling with Sue, I can't move the seat far enough back to make room for both of us, so I leave it behind in that case. The seat pinches too much on the sides, and it only seems to be useful when I'm paddling alone. We are pretty comical when the 2 of us are in it together, and we've noticed a few folks having a good laugh at our expense when we've used it to get to the beach from our favorite anchorage at Barnegat Light. I'm 6'1" and 215# and Sue is 5'7" and in great shape (nope, not going to mention her weight!
that would be risking too much), so we probably don't count as 2 "small" adults, which they advertise that this model will accommodate.
Of course the 370 is made for 2 to 3 and would be far more suitable for us together, but I think most of the same issues would still arise. I can't ever see taking Sue off the boat for dinner or a casual day on shore with any kayak. We'll need a dinghy for that. This is a good thread because boat size is limiting for us, too, I think.