a) I have an un-modded Wii, a legit FreeLoader & US Brawl ... all works fine.
b) Brawl is 60hz only ... do not use your Sony experience as a basis for comparison.
c) Ignore ItsMetaKnight ... the FreeLoader may or may not be disabled soon ... no-one knows 100% for sure yet, and, even if it does, Datel will find a new way ... Datel also offer, and have done for years, free upgrades & replacements on their disc-based products.