I've seen them at shows but not (yet) bought any. They're quite 'chunky', slightly bigger than Mutineer, not quite so finely detailed but better than Old Glory, for example.
I'd use them in separate units, but I'm not a purist when it comes to size anyway, especially for troop types not done by Mutineer.
BUT worth mentioning that Mutineer are talking about releasing some more packs, including variant Mutineer sepoys and British lancers, hopefully later this year.