The "Resource" is the "air" version of the Genisis React Pro that I've got. I've been very happy with the React Pro, so I think you'll be happy with the Resource.
The Resource though is a "single button" computer. I have a Sherwood Logic that is a single button computer that I used before I got the React Pro. They both perform about the same on a dive, but it's nicer having a two button for setup and review of dive logs. just more user friendly and easy to use is all.
BTW... You can buy a new Resourse Pro for $198 bucks.
Not sure what the difference is in the Resource and the Resource Pro is, but I'm betting that it's just more user features, like more logged dives, 3 min saftey stop timer, date/timestamp, etc... stuff possibly like that.
-mike