Yes! There is no substitute for fresh fruit juices in any drink. Cointreau rules!!A big plus to the recommendations for Cointreau and fresh lime juice as opposed to mixes. This plus almost any halfway decent $20 to $30 tequila will yield a better result IMO than a $60 dollar tequila with a mix.
Espolon Blanco, Cazadores Blanco, Exotico Blanco, Cabrito Blaco and Corazon Blanco will all yield a very decent margarita IMO but just say "No!" to mixes.
I haven't had Lunazul yet but @OldAF isn't the first recommendation I've heard for it so that is potentially another solid candidate.