I think it depends on what old devices you want to support?
iOS stability won't be the issue, but the difference between an iPad3 and an iPhone 3G is so much that you would need to test your app on the hardware to get any feel for how it will perform in comparison.
It may work fine on both or may struggle on the 3G, but that depends on what your app is doing.
I'm suprised there isn't a forum or thread where people sort out helping each other test on different hardware, between everyone I'm sure we'd have most devices covered. Maybe there is a thread? I'm new! :)
I'd be happy to test your App on an iPhone 4G if you need any feedback.
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