Welcome!
I spent quite a bit of time using rigid hull inflatable boats (RHIBs) in the Navy. They are a blast and a half. They are able to handle much rougher seas than a similar size regular boat and weigh significantly less. A standard Mark 1 Mod 0 fish hook is not likely to puncture the tube of a RHIB. SCUBA off a RHIB is ultra easy, though getting back in can be a challenge. Sitting on the gunwales is a lot more comfortable than on a hard sided boat as well. The reduced weight and increased buoyancy can make it easier for two people to handle at the trailer as well. I think a RHIB can be an excellent choice and that one looks very well outfitted.
The down side is, of course, increased maintenance. While the tube material is tough, it can still be punctured and the seams can come apart. They have to be inspected fairly often. You still have a fiberglass hull and a transom that can develop rot just like a regular boat, and the draft is not significantly less than a regular boat. The only boat I have geared up in for SCUBA that was harder was a pontoon boat - neither offers a particularly stable platform to work from.
Inmar is a well known international brand that produces a quality product. Not as well known as Zodiac, for example, but still good.
