Hello all! I've had my dse901 now for nearly a fortnight, and its been very good indeed, but over the past day or two i've noticed a drop in the vapour and throat hit. It seems a bit up and down really, kinda random really. One thing i have noticed is that by popping a drop of liquid makes it very good for about ten puffs or so, just like new. I've got two batteries and the performance is equal over both so i'm assuming its the atomizer. What i would really like to know is what is everyones general concensus about the lifespan of the 901 atomizer? Thanks!