I have created an app (I have the .ipa file) with ad hoc provisioning profile. I have included 5 devices in the provisioning file (one is mine and the others belong to other people in my team). Now I don't know how to install it on their devices. If I try it with iTunes, by double-clicking on the .ipa file I have to authorize their devices on my mac, I don't think this is the right way to go... Of course I don't want to do App Review submission. I'll do it when the passes first tests.
To make tests between teammates, I would recommend to use testfairy.
TestFlight is other option, but it has some drawbacks: