I guess we were just lucky. A month ago, I ordered a DSE901 kit + 2 extra batts + 1 extra atty + a USB charger + a 15ml bottle of 36mg Camel juice + 5 blank carts from e-smokeytreats. My wife and I are (were) both heavy smokers.
I opened the box, put two 901's together, dripped them, put the two spare batts into the two chargers, and haven't stopped vaping since!
I ordered more juice, 4 extra attys and a 2nd wall charger as soon as we decided that vaping was for us. I've cleaned one atty in boiling water one time (no difference really). I blow the 2 attys out every few days (from the batt end) and change the poly filling once a week or so. I put 2-3 drops on atty at the start of each vaping session - and wet the cart 3-4 times a day. We both do a LOT of vaping.
Still using the first attys (except for a test of the 4 spares) and all is well. From what I read, we have been lucky. Original attys and batts and still lots of vapor.
I do NOT recommend our method, but it does show that luck and a good supplier have
something to do with the experience. I think this whole vaping thing is GREAT - and so does my wife.
Just my 901 experience. I have ordered 3 spare batts since (and more juice, of course). I've been cutting the 36mg juice with Humco glycerin (99.5% USP) from Walmart - 2/3 juice to 1/3 glycerin for 3 weeks - no ill effects yet.
Happy vaping!