There's been a few products like this recently on iOS and Mac (by like this I mean things that could improve my productivity, workflow etc.) that I would like to try but aren't willing to pay for upfront. I won't know if they work for me until I try them. I know it's not a lot of money, but it is if I only use it once and find out it's not for me.
It's more hassle to implement but a free with iAP is surely a better monetisation model for a 'utility' app like this?
I'm not sure how Apple does this, but with the Play Store, you have 15 minutes (I might be wrong on the time) to get a refund after purchase, so that you can make sure it works on your device, that it is what it says on the box, etc.
It's common for iOS and OSX apps that are tool oriented/helpful to the user to have a price. Frankly, I'd rather pay $2 than wait 5 seconds for some random full-screen advertisement in the app every time I open it.
It's more hassle to implement but a free with iAP is surely a better monetisation model for a 'utility' app like this?