I am primarily a Scotch drinker but havde recently branched into aged rum and have tried a couple anejo tequilas.
When I was in Florida the guy at Total wine recommended Don Sergio, said it was a decent sipping tequlia and at $25 roughly half the price of the Don Julia and Herradurra.
Prior to this the only one I have had was a mini bottle of patron anejo, which was very smooth but it seems to have been aged to the point that almost no tequila flavor remained. The Don Sergio seems to have a better balance between the earthy agave taste and the oaky vanilla aged flavor, as well as some nice spice and a little cinnamon. Though the finish is a tiny bit more harsh than the patron (though not unpleasantly so), I would say I prefer this one by a long shot.
I haven't been able to find many references to this Tequlia anywhere, and I was curious to see how it stacks up to others.