My point was when you buy these add-on pieces for your particular smart phone, then all of a sudden you're stuck with what the phone manufacturer decides to do. Think about all the people that bought (or just bought) the Tascam microphone. When those people decide to get the new iPhone, they now have to get a new microphone.The problem with the Tascam is that it's built for the iPhone 4 and below, and the Zoom iQ5 is for the iPhone 5 and hopefully beyond.
For this very reason, I prefer to leave my phone as my phone and convenience item and any recording will be done by a real recorder. If you buy the Tascam unit, its obsolete since you can't use it on the new iPhone, and the Zoom iQ5 has a limited shelf life until Apple again decides to change it's dock-connector.
Not a problem, a solution, you buy the mic that fits your iOS devise.
Like the OP, Im recording rehearsals/gigs for my reference, maybe send clips vis txt msg or email to others, for that purpose iPhone beats the hell out of any separate recorder for ease of use, and the sound/vid quality is on par.
I've used everything from cassettes (back in the day) to flash to SD etc. any separate recorder is a hassle, you have to deal with it and its power source, compared to always having your phone with you its a no brainer.