Zodiacs boats have 2 main quality levels. The boats within their 'Mil-Pro' line up are very well constructed and pricey. This would include both some RIBs (Hurricanes, SRMNs & SROs) and SIBS (Futura Commandos, Heavy Dutys & Grand Raids).
Everything else they build falls within their leisure market and tends to get mixed reviews. I have seen a Zodiac with PVC tubes where parts of the tube had become completely rigid and brittle. If you tried to bend it it would simply crack.
Having said that, their is also a wide range of hypalon quality levels. Pennell Orca is one of the premier brands of hypalon fabric, and they have different levels of fabric weight and strength within this brand;
Note that within the above chart that their are different grades of so-called '1100 dtx' hypalon, so it is important to be very specific about fabrics when ordering an inflatable boat or tubeset.