I really liked the nano. I went through 2 boxes that I stripped the threads - I was a newbie. I still have one with the stripped threads as a re-purposed emergency single battery charger. Then I went to the toptank nano - same thing basically and that box lasted. I used it for the longest time. Within the past month or so I finally decided to part with it and gave it away here - box and tanks and all. I have a KBOX 120watt red 2 battery box and a nebox that I use in my current rotation. I have 2 kbox minis 75W (Chrome and White) put away - one never used and I even have a barely used mini c tank and box that I like but that tank does not take the rba piece and I have 2 never used neboxes. I still like and use the older Kanger stuff.