Can this be surfed? - Yes! Just like any other inflatable SUP. It is too long, too wide and to stable to be considered a surf board, so you will need a SUP paddle.
Weight range for the rider - With inflatable SUPs, it is not an exact science. We have a formula for our Rafts and Kayaks, but it is based partly on tube dia. Our volume is 288 liters for comparing with other inflatable SUPs.
Price - The differences in price is where it is manufactured (Idaho). There are A LOT of china build SUPs on the market...we just didn't want to go there. We did try to sweeten the deal with the warranty.
Construction - No, it does not have holes in the bottom, but it is not a sealed pocket, so it does take on and drain water. Why? reason number 1 - waterproof zippers are extremely expensive and, as pointed out, would have put the board way out of the target price range we were shooting for. So we started prototyping some designs based on our regular floor pocket. Reason number 2 - We found that having a little water in the floor did make the board more stable on the river (ballest). Here is a pic to show the zipper, mesh drain system and internal bladder:
What it rigid? - Ha! that is a good question.
It is an inflatable so no, it is not as ridged as molded plastic or fiberglass. It is comparable with other inflatable boards, so there is a little flex (just like an IK has more flex then a plastic whitewater kayak). We use RF welded, tightly spaced I-beams, so our board "feels" different underfoot compared to drop stitch. The I-beams will compress just a little so it has a softer feeling "touch" but is about the flex as DS from tip to tail. Drop stitch inflates to about 12-13 psi, the I-beam inflates to about 8 psi.
There is some videos and instructions coming! We are just waiting for the White, black and lime colored board to come off the line before we shoot, so stay tuned.
Let me know if you have any other questions!