I think the review makes many interesting points, but I'm surprised a bit at the overall rating. From an ultralight standpoint, this is a niche product. It is lighter than self-inflaters, but not nearly as light as closed cell foam. It is warmer than many of the inflatables, but not as warm as some of the down insulated ones. In other words, it offers no clear advantage over any other product. Of course, neither does any other pad (or many other products). I think it is especially hard for an ultralight company to recommend a product that will likely increase the amount of weight the user will carry (it will be the first time I've increased my base weight in ten years). This may explain the overall rating.
The complaints about the price seems pretty silly for a company that makes $200 pullovers (one of which I'm happy I bought). I can understand the complaint, I guess; for that much money you expect a truly ground breaking product. But what are the alternatives? If this is too expensive, how about comparing it with another product. In the car review world, this happens all the time ("it seems a bit pricey, since for $2000 less you can buy a Hyundai..."). I wonder if the comparison wasn't made for the reasons explained in the first paragraph.
I do like the "room for improvement" section. Side tubes sound like a good idea. I also like the idea of a wider pad. I've talked to lots of people who would prefer wider (self inflating or non-self inflating) inflatables. That being said, the 20 inch wide mattress is a bit of a standard. My wife and I use a Feathered Friends groundsheet, where we insert the pads and have a wide bag over the top. A wider pad wouldn't fit.
For solo use, I like the idea of adding a couple inches of closed cell foam to the sides. If I add a thinlight to the bottom, this actually solves two problems at once. The thinlight adds protection from puncture and a little bit of warmth. The extra warmth that might slip out of the sides should be caught by the extra padding on the sides.