OK - so the the kit arrived.. initial thoughts seem to indicate it's not messing with the OIS ... but even so, the magnet is on the lens itself, so when the lens is off the phone there should be no issues at all with magnetic inteference
I did need to stick the little disc on the case - was hoping it would just attach to the phone, but nope - it looks ok - could have done with being a black ring, but blue doesn't look too bad on the phone
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now here are a couple of shots - one without the lens
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now with the macro lens attached
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you need to hold the phone *really* close to your subject though for the macro lens