I have never ridden the SlingShot boards you have inquired about, but like alot of people, I have an opinion
. Let me share it with you...
In 2008, I rode a SlingShot wakeboard for the 1st time, LOVED IT and ordered one that same day. I loved the flex and the loose feel of it, it reminded me more of riding my snowboard than a wakeboard. Time passed, was introduced to wakesurfing and purchased our first surfable (if that's a word) in 2013 and needed boards. Not knowing anything and liking what SlingShot does, by taking a slightly different approach to things and they treated me well, I ordered up a couple of boards. I picked up their Space Pickle (Surf)
http://www.boards.lv/en/ishop/SLINGS...Pickle-50-2014
and their Reform (skim)
http://www.boardco.com/slingshot-ref...surf-board-4-7
I figure you can use the links to compare the boards to what you are looking at.
Well, the Space Pickle as Nick (Chaos) mentioned is Slow, Very Slow. Now granted, I am no pro, but I have struggled with 3 boats ('13 Z1, '14 G23 and '07 22Ve - all good surf boats) to keep with the boat. When the board does get moving, it vibrates and hums. It's really odd. I have the 5' board and I am 5'11" (200ish).
The Reform I really enjoy riding. I have no issue keeping up with the boat, can recover from quite a ways back on the wave, it is pretty quick and dare I say agile. It is not longer my go to board (that is a Chaos Sixer currently), but I seem to pull out the old Reform on every trip. I also like it since it can go in the wakeboard racks and not worry about damage. Maybe that is why it comes out everytime, there is always room in the boat for it.
I realize that this doesn't truly answer your questions about the specific boards, but thought it may give you some feedback to compare to. For me, if I am looking for a non skim board, I will not purchase a mass produced board any longer. Today, I would only by from Nick @ Chaos or Jeff @ SoulCraft (there are probably some other good ones out there that I don't know about). Both shapers can work with you and get you something that will fit you, your needs and wants better.