The information provided on page: Weight calculation for load balancing - Sophos Firewall
Does not match up with what I recall from my Engineer & Architect training.
This is saying the higher weights pass more sessions; when in reality, I had 2 interfaces, WAN1 had Weight of 1, WAN2 had Weight of 100. Nearly all (99%) of traffic went over WAN1, not WAN2.
Therefore, from training & real-world, I do not believe this page is accurate.