I've hatched three lots of Light Sussex chicks before. Always had good hatch rates and few problems with this breed following standard hatching procedures. (37.5°C, 40% RH -> 60% RH for lockdown).
The breed is a good utility bird: the girls lay quite a lot of eggs while the boys make tasty dinner. In addition, they're also very friendly and easy to handle compared to light breeds. This does mean that they end up bottom of the pecking order when kept with purpose-bred egglayers (brown hens), but they don't seem to object to that. When time comes to making new additions, it's very easy to introduce new birds to the Light Sussex hens. They do prefer to free range, but are also reasonably good in a run because of their placid nature. They do benefit from having plenty of space, mostly due to their size rather than activity level.
Photos here (goes to my Flickr account search results)
Videos here (goes to my YouTube account, don't think I can limit it to Light Sussex only)
The videos have some good views of feathering as it develops.