The brand new Motorola Moto Z comes with its moto mods which are good but its very hard to carry all that stuff. If we want to listen music with jbl mod it is necessary to have it with you but its hard to carry any mod with you every time. However, the quality of mods are pretty good but useless because anybody cannot keep that mod with him always its hard to carry all mods together. So according to me all these features should be kept inbuilt in the mobile phone. If you can carry all mods everytime than it will be good.