I have been using the 901 attys for 2 months! No problems yet! I use them on auto batteries, manual batteries, the Prodigy and the PS PT! Don't clean them, frequently flood them, just blow them out every once in a while both by mouth and with compressed air, try to remember to turn them upside down at night and just yesterday, wiped the threads down with Brasso. I have 4-5 that I just pick up and use when I change flavors, devices or whatever. Both I and hubby use them so they take a LOT of abuse because he refuses to listen to my well researched advice! LOL. I don't have any other attys except old SE Gold which I haven't used since getting the 901. I hope this helps, but I imagine they will all spontaneously blow up since I just said they were doing great...LOL