Pretty sure he's saying he also would like to see a review of the low version.
+1 is a way of saying "me too - I'm also interested in the answers to all of the questions above".
Alternatively - If I gave it a "likes" vote, that would not convey the same meaning as a "+1", in my mind.
My spare seat is a standard Seat Concepts seat. It sits higher, and it puts my helmet further into the turbulence zone that is coming off of the top of my windscreen. Not good, so I continue to use my Corbin, at this point.