Phonak covers all the basics and then some with the Audéo PFE232s. Phonak's implementation of customizable sound signatures is perfect. The filters can be swapped easily and they provide an audible change to the sound signature, without ruining the core qualities. The force of the PFE232s is that they have a delicate balanced sound signature without noticeable flaws.
They are lacking somewhat in the sound stage department compared to the Westone 4Rs, but the difference is small. One difference that is important is the fact that these in-ears are much smaller than even normal single balanced armature in-ears. The size and shape of these in-ears allows you to get a level of wearing comfort almost on par with that of more expensive custom in-ears.
The Audéo PFE232s are awfully hard not to like, the sound quality is pleasing and the signature can be tailored to your liking. There is one major flaw and that is the price. Compared to the Westone 4Rs which we recently tested, these are quite a bit more expensive and since they fall behind them one some key performance aspects they are not quite as brilliant value, however, for people with small ears these are definitely the best offering out there.