I’ve worn both, and the dot is tiny - it takes a 10 battery and is really tiny. The Azure by comparison is a large aid, but still a mini-BTE - it takes a 13 battery. EDIT - my Azure comments are based on the model introduced in 2007, not the update model in the slimmer housing introduced in April '08.
You’ll get right at 6 days battery life in the dot, and 21 or so in the Azure. I never bothered changing programs with the Azure, so the dot was just fine with me.
The dot is a receiver in canal aid, whereas the Azure can be configured as a regular or open fit thin tube BTE. If you have wax buildup issues, you may prefer the Azure, as the cleaning of wax from the thin tube is less involved than cleaning the receiver and wax guard on the dot.
If I hadn’t had perspiration issues with the Azure and the dot, I’d be wearing one of them today. As it is, I’ve had no issues with perspiration with the Pulse aids I’ve had for about 11 months, so I’m still wearing them and still very happy.
I’m still waiting for the release next month of the be by ReSound. It looks like an interesting concept to give you an open fit and the best cosmetics.