Check out the link, poor plastic, UV fading and cracking problems, poor hardware and the one not touched on by the pdf but the biggest in my opinion is the warranty and spare parts support. With the Safari brand you get a warranty to back up the snorkel if something were to go wrong, not fit, etc.
Above that, the industry has shown that there is room to make a snorkel offering without having to plagiarize the design of another company, its not that big of a market

Reward innovation, R&D and industry support even if it means spending a few dollars more on a legit product.