Interesting, pretty much a prone board called the Surf Board.
If you looking for something similar as a Midlength and a fair bit cheaper you would have to consider the Casey Pilot Mid.
5'1" x 18" x 3 3/16", 37.l Casey versus the 5'1 x 17" x 3 3/4" 45L: Arnie. The Casey is slightly wider not as thick and lower volume....both great looking boards on my short list, and the 4.9 Armstrong @38l...
there's a ton going on on that armie ML tail - contours etc . it's the first thing that stood out to me. Infact the whole bottom deck to the subtle double concave - it's actually a damn nice board to look at it - a lot going on above my pay grade that's for sure.