Unfortunately, I too am contemplating this. I have an 8x which I think is a really nice phone (apart from the very flush buttons which makes for poor usability IMO). I liked it better than the 920 and compared to my iPhone 4, can't say I feel like it is much of a step down (though, Apple does have that extra 5-10% of polish and finess in its hardware - but it beats everybody in that respect).
Although I've only had the 8X for a few days, these are my major issues:
- No way to close apps in the multi-task app viewer. I know this is a popular request and I imagine will be fixed, but it is such a glaring mistake IMO.
- Poor battery life. I've heard it takes about 2 weeks for the battery to "settle", but so far I'm barely getting a full day's worth of usage. My iPhone 4 used to be at like 80% at the end of the day with the same usage patterns.
- TellMe is still far behind Siri and Google's version. I don't know where to find a comprehensive list of commands, but things like "Set calendar appointment" doesn't do anything. Without some of these what I call "basic" functions, TellMe is just a gimmick. Finding the distance between the moon and the Earth makes for a cute ad, but support for these workflow improvements is the real key IMO.
- No built-in turn-by-turn GPS. Given that every other phone offers this, it has morphed into a table stake for mobile devices these days. Any WP8 apart from Nokia is missing this key function. You might say, there's an app for that, but...
- Lack of apps! In the first couple of days, I thought this wouldn't bother me, but now it is starting to getting frustrating. I know Spotify, Pandora, and Mint are allegedly coming and in the meantime, I'm using Xbox Music and Slacker (but missing Mint), but the sheer lack of quality in the app store seems to be an issue. If you have any suggestions for a decent navigation app, I'm all ears! I am trying a 30-day free trial of Scout right now. Leaving on a trip soon, so I needed something. Also, to the people saying "Instagram doesn't matter" - you're totally missing the point. LOTS of people use Instagram - if the app isn't available to them, why in the world would they switch to WP8? It's like if a BoA app wasn't available - I would be thinking really hard why I would switch over when I wouldn't be able to do mobile banking. And the right solution is not "just switch your bank".
- The OS X Windows Phone Connector basically is useless. It doesn't sync at all. It crashes 100% of the time when I connect the phone (even after numerous re-installs).
Of course, this list is just a few of the things that bug ME in particular. The issue of course is that these are all better / not problems in Android / iOS. I switched over from an iPhone 4 and MSFT needs to ensure that people who do that don't feel buyer's remorse. That's the only way to turn them into evangelists because WP8 does have some GREAT things about it (the lock screen customization, the live tiles, the People hub, etc. etc.).
If the Google Nexus 4 actually becomes available, I would have to think hard about what I want to do. This saddens me because for various reasons I won't go into, I'm really hoping WP8 does great.