I don't know why some people are so obsessed with efficiency. Efficiency is, at best, one attribute of many which make something practical. We have had engines that are 50% thermally efficient for decades now, but no automaker has attempted to produce them because they are impractical in hundreds of other ways.
Not only would I buy this for my boat, but I would replace my more efficient spectra watermaker with it. Less noise and less maintenance are massive advantages.
Right. Panels are so cheap now that, unless you are limited in how many panels you can physically install, lower efficiency just means another panel. Even then, maybe you cant a pair of them in place of one so one picks up morning light, and the other afternoon.
Not only would I buy this for my boat, but I would replace my more efficient spectra watermaker with it. Less noise and less maintenance are massive advantages.