Someone requested that I create a post about what makes a good tequila. Here goes.
For me what makes a good tequila is actually being able to taste & appreciate the flavors and tones of tequila. Blue agave is a type of cactus (it can serve as a sugar substitute) and what most tequilas are made with and 100% blue agave is the benchmark for a well made tequila. I mention this because some low brow brands, who mostly but not entirely, cater to the domestic market, use fillers in their tequilas because it's cheaper and quicker.
Another factor that differentiates tequilas is the distillation process. Most tequilas are double distilled. I prefer triple distilled tequilas and the whole Tres Generaciones line is triple distilled. What is the difference and how does that affect the taste? The 3rd distillation takes away a touch of the agave taste BUT it also greatly reduces the burn and bite that double distilled tequilas have. The net effect is that because there is almost no burn or bite you can actually taste the tequila. That is what I'm after.
Another thing to factor is how long the tequilas has been fermented. This greatly affects the taste and character. The darker the tequila, the longer it's been fermented. You have 3 main categories, silver (unaged and clear in color), reposado (2-12 mo. fermentation in oak barrels and gold in color) and añejo (fermented 1-2 years in oak barrels and a caramel color). Añejos have the greatest range in taste.
What does Tres Generaciones Añejo taste like? The nose is oaky, a floral background and very smooth, silky. It's hard to tell you're even drinking an 80 proof alcohol. The body: the oak taste continues but steady in strength with a hint of oilyness while the floral changes to citrus, there is also a slight warmth. It finishes with the agave bursting through nice and clean (it's like a buttery-honey taste) but short, crisp with a slight increase in warmth. Ahhhh... tasty.

No burn, no bite, very smooth.
While the brand I recommend isn't the best, for the price it's an outstanding value. Tequila sites & experts rate it about a 90ish on a 1-100. Also the $30 is what I pay in Mexico. I just checked BevMo and they have it for $44. Of course the further away from Mexico you are, the more expensive it's going to be.
P.S. Jose Cuervo is not drank very much in Mexico and most of it is sold for export.
tl&dr 100% blue agave + añejo + triple distilled = bestest tequilas