I'm still on my first device. Launch red 920. Absolutely no problems with battery life, freezing, or reboots. Only problem is dust under the FF camera, which I actually thought would be worse by this time. I count 5 dust particles, up from the 2 I saw a few days after purchase.

What are you guys' thoughts on the dust accumulation later down the road? Harmful? Strictly cosmetic?
If my Lumia completely stops working randomly one day, I would be lying if I wouldn't immediately think of this dust issue...