At some point in the past (maybe when they were purchased by ACE?), Zero Halliburton decided to decrease the maximum stress their joints were designed to handle. These days, it's very easy to break a ZH case compared to a pelican, especially when open. Most ZH bags aren't watertight either.

ZH is aesthetically superior to Pelican in my opinion, but I trust pelican more to keep my gear safe and dry.