I love my evo batts. My first 401 manuals shorted out. But my EVO's are still alive and kicking. I use the manuals and I got them from innovapor. They are still having a huge blow out sale. I have had them for 2 months with no decrease in performance.
The attys I have to change out about every two weeks due to decreased performance and my passthrough tends to nuke my attys. The evo 401 attys perform awesome though and for $9 a piece, I don't mind changing them out. Usually what I do is use an atty on my battery only for about two weeks, then finish them off on the passthrough.
I vape about 3mL of juice a day and exclusively drip (no carts at all). Maybe thats why they don't last as long as others have posted on this forum. I also vape VG juice, which from what I have read, can shorten atty life. Even still, at $18 - $24 a month, it's still cheaper than smoking and the batteries are tops! Two months on the same 3 batteries, which get 2 to 3 charges a day each, they perform phenominally.
The 401 is highly under rated. The throat hit is amazing. The vapor is massive and the taste is great. I love this product. The innovapor stuff is great and the best prices I have found. My only beef is the primer fluid they use in the new attys. It tastes like crap. What I do is soak the atty in vodka for about ten minutes, rinse with hot water and blow it out. I let it dry for a few hours, then prime it up with juice. That gets the funky primer taste out and it vapes phenominally.