Yes, agreed! The tactics trainer keeps my chess eye sharp.
Tactics Trainer

I love the tactics trainer. I find when my play starts to deteriorate to a level that I am just not happy with, I hit the tactics trainer hard & it seems to bring my brain back to a better place.
Right now I am staying off of live Chess until I have logged 5 or 6 tactics trainer hours. Hopefully this will stop my Chess landslide that I am currently on :)
If I received nothing else from chess.com by being a premium member, just having unlimited access to the Tactics Trainer makes it worth it. Great stuff.