Several dead links but Mike's old pannier listings will give you many more options to explore.
Asking for opinions about a top of the line product like Arkel is not going to help you make a decision, only to rationalize your purchase.
What do you need in a pannier besides the implied status of the Arkel brand?
Durability, waterproofness, capacity, convenience, mounting system, completeness of system components and other bags, cost, mass, external lashing options, off-bike functionality, and other factors are what usually contribute to pannier purchase decisions.
The Arkel could probably last 20 years of intensive use for which you pay in cash and weight; do you need that kind of longevity?
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