If I was in the market I would make it a point to go see it and RIDE IT BEFORE I BUY IT.
On the surface it appears to be a strong candidate. With only 20 hrs, it should show like new inside and out.
Some of the things to look for:
Hull Condition- Crawl under it and inspect it from bow to stern. Some light scatching is normal. If you see concentrations of scratching or gouging on the bow... that would indicate 'shore parking' and increases the chances of debris being sucked up the intake grate.
Intake grate- Bring a small flashlight with you and look up into the grate cavity. The driveshaft should be clean and shiny with little to no rust. The boot (the rubber sleeve on the shaft right in front of the impeller/prop) should be free from damage and hugging the shaft.The impeller edges should be smooth and straight. Notice the collar that the impeller edges are in tight tolerance to. That is called the Wear Ring. It should be smooth and free of deep scratches and gouging. Ingested sticks and rocks will mess up blade edges and wear rings, and can ruin them!
Pump/Nozzle/Reverse Gate/Linkage- At the stern is your external propulsion system. There should be no missing connections. Look for nuts on all threaded shafts. (Again, with only 20 hrs it should be like new back there) Gently but firmly grab the Reverse Gate and pull it down over the jet nozzle. It should slide easily but not loose and sloppy. The reverse grab handle up by the handle bars should move up and down. Grab the Jet Nozzle and swing it left and right. The handle bars should swing in unison.
Bilge- pull the seats off, lift the 'hood', pull out the storage tray, and inspect the bilge area for cleanliness with that flahlight. No fluids, oil, coolant, should be found on the bottom.
I noticed in the pictures it does not have Nevada identification, Nevada tags, or Lake Meade Recreation Area annual tags on it. Ask the owner if it's been in the water here yet. (I'd keep the tag info to myself...nod nod, wink wink, and see how he responds) You can get on the water without tags and ID, but you wont get through a Ranger Station at he lake without paying a fee.
Also be aware that your model RXP has an inherent superchager issue re: internal ceramic clutch washers that MUST be replaced with metal washers sooner than later. Others will chime in on that subject...It SHOULD NOT be a deal breaker IMO. Ask the seller If its had the SC washers replaced. I'd bet $ the answer will be no.
When the lanyard is placed on the DESS post (ignition Post) You should hear a BEEP BEEP indicating the computer has read the key and all systems are go, and it should start without a problem.
If your comfortable with all this, go for it and good luck to you. I'd try and knock the price down a bit (using any damage I find and the ceramic washers as leverage) but that's just me.
If you're a newbie and aren't settled with all this... call Pro Marine on Lake Meade Dr. in Henderson, Ask for Jesse in the Service Dept. and ask him what he'd charge you for a pre-purchase inspection. If I cant DIY something with the help of this forum, he's the ONLY guy in the valley I'd let touch my RXT's. (And even then I dont like it too much)
If Ive missed anything throw a post back out there.