I dropped my boyfriends jar (jar is okay) and the lid got really dented. So, I ordered one replacement lid. They sent me two! Pretty cool and the price was super cheap too.
These devices are my new standard for long term storage.
I initially just bought one to try it out after reading about them, now I have 10... These have been working great for me and I love the ability to recharge them.
Just follow directions and item does its job, just check it periodically and recharge as required. Very happy with it. Keeps items at correct humidity level.