Today is a very exciting day... I've never gotten excited about drone and the small sensor output. I actually looked at Solo's before I got me Phantom 3, but somehow missed the HDMI out. I always figured it would cost $2K + to fly a larger sensor...
Still some wrinkles that need worked out, but flew the Solo with A5000 and kit 16-50 (425g) a bit ago using the Sony app. You can see some samples here:
Aerials I did downsize to 4000 px wide since I cropped one, but you can still see a better image. Used MF, and think I may have focused a bit too far away, I'll have to work on that.
David: Atomos and Wooden camera make a 12" coiled Micro USB cable. i think I'm going to replace the stock which should solve that problem. I was able to get a bit more slack, but the stiffness of the stock HDMI cable off the main board is workable but seems to pass a lot of vibration which is documented elsewhere. I do want to be able to use the Gimbal at times though since I think this is going to replace my Phantom, so I'll have to see about mixing and matching (or I'll just buy a second for the price?)
Sony's Timelapse App worked great (I've used it before but a few features were quite useful here). It's a $9.99 app that installs on the camera, not on the phone. You can setup your parameters (10 second interval worked great), then press the shutter to start the sequence as you take off. The screen displays a countdown to the next shot which shows on the phone screen. I found this pretty helpful, I set the gimbal at a little more down angle than ideal. With the timer counting down, I was able to fly forward or backward right before the photo and change the camera angle ~ 5-10 degrees which framed a few shots better than how it was oriented while hovering. The exposure does seems to stay fixed through out the exposures. There is a bulb ramping mode in the app, but I don't know if it'll adjust every shot or if it's linear, will have to test. That did make the sunken boat need about 1 stop of exposure compensation and a bit of shadow lift. That said, if you know what you're shooting you can fly in any PSAM modes so you can fix exposure pretty easily, or figure then dial in exposure settings. Other wrinkle that I haven't solved, unlike the go pro, there isn't a way I can find to flip the orientation of the read out, so if you mount it upside down without a cage, you have to get used to flying mirrored from your display. I tended to maneuver looking at the bird, then fine tune framing before getting the shot I wanted.
All in all It's not a seamless experience, but flying a RAW capable large sensor camera for this price is pretty amazing.