Build
I won't talk too much about the build, that's something you can and should feel for your self at the store. It's light. Really light. Which is good. Feels a little cheap to me, but I'd rather it be light and feel a little cheap, than have to haul around a luxurious concrete block. Overall I can say it feel nice though. Maybe somewhere between the NEX-6 and the A7. The lens barrel feels really really nice.
Controls and Handling
Controls and Handling is where this camera receives it's second strike from me. The controls are a little fiddly...on second thought, they're really fiddly. I don't really have too many complaints about the layout. The menu is like anything else made by Sony in the last 6 months, and the button layout isn't all that much different. I'm not crazy about the way Sony designs it's layouts but I can live with it. My main complaints are little quarks here and there. First, it's slow. Not so slow that it's unusable, but slow enough to be annoying. Record times aren't great, the zoom is really slow compared to anything with interchangeable lenses, and if you try zooming during the shot to review time, it will zoom into the reviewed image and not zoom the actual lens. This sets you back and can keep you from getting the shot. Next, I can't get it set up like my A7, which is annoying. For those of you who don't know, Sony allows for highly customizable buttons, but for some reason not completely customizable. For whatever reason, the closest I can get to my A7 is somehow still the opposite, so that continually throws me for a loop. The last notable quark I can think of (but I'm sure not the only one) is found it is really easy for my finger to bump the zoom. Since the zoom is an electronic zoom it's also really not very accurate if you are trying to do precise focusing. Now, keep in mind these complaints are me nit-picking. Overall, I would say the handling on the RX10 is on par with anything else in it's class, so don't take this as it's Achilles heel so to speak.
Price
As of writing this, they just dropped the price from a rather pricey $1300 to just below a more reasonable $1000. I picked mine up on amazon warehouse for $850 and since then I've seen them go as low as $750. $1300 was a bit of stretch for me, but $750 puts this camera easily in a fair price range.
Conclusion
Can you use this to shoot weddings? In short - a resounding yes. If you know and understand it's limitations, it really does it all and at a great price too. It certainly won't be for everybody, but I have to say I'm impressed with what this camera can do. Will I continue using it for weddings? As my main camera, absolutely not. As a second body (and a 4th or 5th to my wife's cameras) - possibly. However, if I was forced to use this as my only camera, I wouldn't be in the least bit nervous. In fact, if I was forced to choose one camera, and one lens for the rest of my life, this might just be my choice. Would I recommend it to others? Depends. If they were on a tight budget, just starting out, just want a well rounded back up, etc., then yes. For someone that has an endless budget and demands only the best image quality, then probably not. The image quality is a compromise. In fact that's all this camera is - one giant compromise between the best of all worlds (they call it a bridge camera).
The Elephant In The Room
The Panasonic FZ1000. I know. I just gave the RX10 a (mostly) rave review, but the new FZ1000 looks to be a mighty fine contender to the RX10. I can't really give my recommendation on which one is better as it isn't available yet, but it looks like the winner to me. From the samples I've seen, the image quality looks to be a bit better (and the bokeh, much better), it shoots 4k, extends all the way to 400mm and at a better price too. It has a few other improvements but it also looses somethings such as the built in ND filter, constant f2.8 aperture, and weather sealing. However, either camera is exciting to me. If this is the start of a new trend in bridge cameras, I could see the bridge camera regaining some notable marketshare in the not too distant future.
Sample Images
All images below were adjusted in Adobe Lightroom with VSCO packs 01 and 02.