It sounds like marketing jargon. But for engineers dealing with signal drift, bus-off errors, and fried transceivers, that "extra quality" is the difference between a system that runs for a decade and one that fails on a Tuesday at 3 AM.
The plant manager noted: "The extra cost per node was $16. But the downtime savings paid for the upgrade in three weeks." zlg driver extra quality
ZLG provides extensive PDF manuals in their driver packages. These contain specific registry tweaks and buffer settings to maximize performance for high-bandwidth applications. Conclusion It sounds like marketing jargon