I see a lot of posts and reviews from people for Inflatable SUPs where the reviewer has almost no experience with stand up paddling. There are some high quality inflatable SUPs but most of the low cost / bargain inflatable SUPs are going to be a major disappointment for people who want to do serious touring or surfing.
I am posting this after watching two guys who were at the beach this morning trying to inflate a SUP with a hand pump. They were pumping like mad and not making any progress. I usually go for a 3/4 mile warm up paddle before I surf in the mornings, and when I got back from the warm up paddle they were still pumping. They finally got their large SUP out in the waves but it was not inflated enough and did not have enough stiffness to stand up on it, so back to the beach and more pumping, finally one guy managed to stand up, but he spent most of his time laying face down and getting washed in sideways, since he could not kneel and stay on board. I could have surfed better on a air mattress. You can buy a decent used SUP for around $400 -$600, the sky is the limit if you want to buy a high performance board. Be sure to try out conventional SUPs and give them a test drive before you spend money on a bargain inflatable or any inflatable for that matter, unless you intend to travel with it extensively. SYOTW