Regarding Nanocoating: ReSound began nanocoating their instruments while the Live/Dot2 were their newest products. Units within these families that were produced earlier won’t have the coating, but those produced more recently will. All Aleras have the coating.
Regarding Wireless: You don’t “need” the Alera’s remote control, phone, and television accessories the same way that you don’t “need” an HDTV or an automatic transmission in your car. If I wore hearing instruments I’d want to have the optional wireless accessories. Being able to carry on a conversation on the phone without having to hold anything in my hands and being able to hear clearly in both ears rather than trying to struggle in one is a huge benefit that I would appreciate!
Regarding Differences Between Dot2 and Alera: Without using wireless accessories the difference isn’t night and day, but there are some additional refinements in the Alera (particularly in the high end models) and it runs on a difference chip/processor. I’m told that with their older processor the Live/Dot2 were pushing its internal CPU to 100%. If you’re convinced you don’t need the wireless accessories, another option would be to go with the 60 model of the Alera, which should be priced lower than the standard (61) model. You’d give up wireless capabilities and the push-button (which allows you to have more than one program saved to the instrument), but you’d be getting all of the refinements of the Alera in a Dot-sized instrument.