Which one of these have you tried?
The lemon ones just taste like toilet spray to me. He olive one has no place on BBQ IMHO - though i may give it a chance on my BBQ garlic bread.
The peppadew one isn't bad - but detracts from flavour of the meat as it is a bit spicy. The shake me is ok too.
Right now I'm using this. Bog standard seasoning and fairly inexpensive.