Absolutely no idea about the Ribtec, so I can't comment. I had a RC 585 for around 6 years & on balance it was probably the best boat I've had, not that I've had many. Needs plenty of horses on the back, I had 175 but a 135-150 would be plenty. If I had 1 complaint, it was a tad short of freeboard on the transom, but that was with a full load of divers. I'd buy another without any qualms if I was in the market for that size boat.
Rule#2: Never argue with an idiot. He'll drag you down to his level & then beat you with experience.
Rule#3: Tha' can't educate pork.
Rule#4: See rule#5