In general very good but there are quite a number of interference problems on both left and right hand devices, sometimes both at the same time which have grown in number and frequency over the period since I have had these new models. The problems may be in part ones of instability or, in most cases, a growth of emissions in the local area and this can be extremely irritating and definitely uncomfortable as well as causing major problems in listening to other sound sources such as people with whom one is trying to have conversation with or other sound sources. This problem certainly needs to be resolved rapidly certainly as far as I am concerned and it certainly detracts from a product which is a marked improvement on its predecessors.