After a few sessions now, I am pretty stoked on what the Wing-Surfer can do. It is a great compliment to our existing arsenal of ocean riding equipment. There is definitely instances were the Wing_Surfer will be superior to Kites and Windsurfing but also some times when our trusty existing gear will be the choice for the most giggles.
To further answer a few Q's;
The wing is not heavy and definitely not heavy to use, it pretty much floats its own weight, and you do not come in because your arms are sore. The first few times you will be little sore, mainly around your shoulder blades and latts, but this is mainly because you're using new muscles in many cases and holding your arms up for longer than you're used to.
Yes it is relatively easy. Way easier than Windsurfing and Kiteboarding. But it is also non intimidating, easy to depower ("100%

) and easy to ditch with no wild outcomes.
There is a learning curve on the Foil. I am a competent foiler and can Prone Foil, SUP Foil, Wind Foil and Kite Foil at reasonable levels, it still took be a few laps to get super comfortable on the wing, particularly on my switch tack. This said though, far less than learning the others from scratch.
Controlling the wing is pretty cool, and not that dissimilar to kiting. The easiest way I found is to allow your front are to just relax and hang straight and use your back arm more for sheeting and pitch control. Lowering your back arm allows the wing to sail up above you and raising your rear arm brings the wing down to a vertical plane. While you are riding these are really the only movements you want to concentrate on, in and out for sheeting and up and down for trim, mainly all done with your rear/back arm/hand.
Yes you can go upwind, and very easily. Even on a SUP non planning. On the foil you will smoke up wind, and find yourself baring away more often than not.
Here is my very first on the foil with the wing. I have bogged around for a few tacks getting comfortable, then this was my first real run.
Here's the GPS of that run.

Here's my tacking upwind earlier that day on a 10' x 27" 125ltr SUP.

Here is some laps on Pittwater during a nasty gusty westerly over the weekend. There was one guy trying to kite at the same time who's kite was falling out of the sky every 2 minutes, it didn't look fun on a kite. The Wing-Surfer easily glides between gusts when you're up and foiling and even runs at amazingly low speeds. Next pic down you'll see the lengths of ride I was getting,

Anyone who's ridden Pittwater in a westerly knows how gusty it is from the west. It was WNW up at the Joey, then WSW, SW then finally SSW as I approached Sandy Point. You can see the yellow spots as I foiled between the shifts in super light lulls.

This is Andy, I shot this from the beach on that same first foil session. This is one of Andy's first glides. He picked it up really quickly.

This is gliding on the Naish ONE 12'6" iSUP (inflatable) in

And this is riding a 10' Malibu. Yes a surfboard in super light wind. Just cruising around having fun being on the water.

I know there is a lot of people trying to dump on the wing, and slag it as not being a thing, or it wont take off and so on. To tell you truth I have heard this many times before, once was when Kiteboarding started, then I heard it again as SUP came along, the resurge of Foiling just a few years ago it came about many times. Each time, these were not inventions of a new sport, as they had been done previously to some point in the past, but technology and the ability to build and mass produce at reasonable costs brought them back into "fashion".
The wing will not be for everyone, but it will suit a lot of you. And you will find it more fun than you are possibly expecting. I will always travel with one now and am more likely to Wing Foil than to Kite Foil, mainly because of the crap conditions I have in my area plus the amazing free feeling the Wing-Surfer brings to your glide. But I also always travel with a Kite and Windsurf Foil too. I am lucky and yes do have lots of toys, but this in turn also shows which work best in a lot of real world scenarios as to what I gravitate to more often knowing that I have the choice to ride anything I want.
Looking forward to getting some more content and images to share this exciting aspect of water sports as soon as my GoPro is fixed

Anyway, look forward to seeing you enjoying your Wing-Surfing soon

Ride safe,
JB