Hi I have experience a low price isup that looks very similar. Last year I bough this GOPLUS on amazon for $289 [now $250ish] and it is fully adequate for my use in lakes, rivers, intracoastal, and calm days in the atlantic. The accessories that came with my board look similar to those pictured in your link. My friends bought slightly more expensive boards in the $350 to $400 range and got slightly sturdier boards, nicer more durable transport backpack, little bit better working pump than that black one pictured. Another friend got an iRocker [$600 range] and it's significantly better quality.

Mine is fine and it works, I was happy with the price. The $400 boards are noticeably better. After a year of moderate use I notice that the PVC at my D-rings shows some degradation of the plastic. The pricier boards seem to have better durability of the PVC. In general they come with higher quality accessories that are easier to use.

Hope this helps you.

Edit: apostrophe