It's too bad that woafp isn't here anymore, as he was great at updating this thread and adding info to educate folks on agave. I have been working to try different additive free tequilas lately and am still enjoying the ride. Some notes on a few I've tried over the last few months..
Siete Leguas Decadas Blanco: This is a limited release blanco made from Criollio agave. This is a really good blanco and the packaging is impressive. I bought 2 bottles on an impulse buy. It's really good, but in hindsight I probably would have only bought one bottle. It's a 700 ml bottle instead of 750ml and was a bit pricey at $140. I don't regret it much because it is really tasty. I might end up gifting my 2nd bottle eventually
Lalo Blanco: This is quickly becoming my go-to blanco. It's readily available, reasonably priced, and really tasty.
Lagrimas del Valle Repo El Sabino: I had never heard of this brand, but after learning that it was from NOM 1123 (cascahuin) and seeing it at a local shop I picked up a bottle. Its 46% abv so a little hotter than std repos. My first sip I wasn't sure about it, but it seems to have mellowed out or I've adjusted to it. I enjoy drinking it quite a bit. Lots of agave forward with a clean finish. I don't know if I'll immediately replenish this once when I finish it, but it's a solid additive-free repo and most things from NOM 1123 are really good.