GAC have rights on the lower river, around St Fagans area I believe. There's a section through Pendoylan south that's run by Cowbridge Anglers. The areas between this and the M4 and above through Miskin are privately owned and are fished by a small syndicate. Through Talbot Green and further...
I've used Bison waist waders on the rivers for years, I know others have had issues, but I've found them to be great value for money.
Although, on a boat, I would prefer a good bib and brace on safety grounds.