By far the majority of people use some sort of protective case on their iPhones (and iPads).

You need a case with a wide open bottom (DXO has a list of compatible cases in their website

If you have a protective case, camera will not connect.

The DXO One is fairly compact, and for the price it should include some sort if soft case to prevent it from being damaged or scratched up in your pocket, with your keys, etc.3

One major downside is that the DxO One will not connect properly to the lightning port if you have any type of protective case on your iPhone

The design of the standard-length lightning connector as the only way to mount the DxO ONE is physically incompatible with a significant percentage of popular phone cases

I also don't think this would work with a bulky case attached

I find this to be a best case scenario, and even 200 shots is really bad battery life in my opinion

I don't want some big bulky case for it, but at least something to slip it into if it's going to be sitting in my pocket with keys or whatever

Thin cases should be fine but a larger case like an Otterbox might prevent it from plugging in

Not to mention the fact you have to bring both out from your pocket or bag and remove them from protective case before you can link both together.

crappy cases.. when you want to connect it to your iPhone

Lightning connector is designed to connect to Iphone/Ipad without the protective case.

Also, there is no way to connect this to your iPhone with a decent case on