Phonak tips are good, they open up the soundstage a bit, highs are slightly airier, they are also grippy and resist falling out of the ears however the mediam phonak tips are smaller than the stock mediums to fit will very from person to person, if you can get them they`re pretty sweet, you can also use comply foam tips (makes the bass a bit muddy though), ue tips also work great, otherwise why not use the stock jvc tips?, I found them to work better then most aftermarket tips.