I have a 2003 Ribeye. It has new tubes now, the old ones were badly degraded and beyond help, I think they were PVC. The fuel tank is plastic, inboard but has a metal plate on top that mounts the sender unit, the plate is anodised steel and not stainless, very very badly rusted, its a common problem but not a big one. It took a while to remove and replace with a new plate on top but the plate was only about £25.
The newer boats have stainless tanks so this is not a problem and I believe they use Hypalon for their tubes now. When I bought the boat I knew the tubes would need replacing.
I have owned 6 different Ribs now, I really like the 6m hull of the Ribeye, it performs nicely with the 100hp that I have on it, giving me about 37/38 knots ish and pretty good seakeepoing/fairly dry for its size.
No other complaints so far, second season on the water.
Ribeye have been incredibly helpful with spares and advice, even asking an engineer of there's to call me after hours from his mobile. Even outside the Marine industry its hard to find help and support like this from a company. I have been genuinly impressed.