I demo'd SBD's 5'10 Flare before I ordered mine. From my understanding, compared to the stonk Flare it's more pulled in at the outline and has a little more rocker at both ends.
When I emailed Tim to order, he said he could base my order off of SBD's file if I wanted, but I ended up opting for the stonk file for a little more low end. I ordered the exact same length/width/thickness (5'10 x 20 x 2.56) for my boar, and the two are definitely different.
@silentbutdeadly might chime in with more input. Make sure you ask for his delicious rail profile though