I was hoping for more input from a longer term perspective, but thanks to
heywhitmarsh for the most experienced viewpoint yet. Bummer about the crack, but I was expecting a minor bulge. This morning some demon possessed my clicking finger, and I bought a 925 that came with a wireless charging shell, so I may try the mod for myself when it arrives.
I wonder if you can trim the contact pins or sand down the inside of the case in key points to minimize the bulge. I'd prefer to have it nice and flush. As far as the compass goes, I haven't heard that anywhere else, so if anyone with the mod could comment, that would be helpful. My old Focus S had similar troubles with the compass, with no mods to affect it.