I've just today sent off an email (to a different retailer though) as this morning my Topside stopped recognising the atomiser. It wasn't the atomiser to blame as I tried another one, then tried both on my Gbox where they both worked perfectly.
I'm assuming a leak because I can see what looks like juice in the ring round the 510 disc.
I'm really sad because I love the Topside and I love the bottles. I used it very happily for a little over a week and loved it so much I was excited to read there was a dual battery one planned.
Nb I'm used to harder plastic so I could easily have squonked "too hard".