I could read in the Dji forum, that Phantom 4 has many issues.
Even with the last update, the thing gets worse.
Do you think that SOLO has such important issues as it has Phantom 4 ?
What issues are around SOLO, right now ?
First thanks to Jerry for reeling me in from a different thread/post I made on the Solo topic. In reference to the OP's question, I bought a Solo before Gimbals were available and was excited about the product. I think it is a well engineered bird but it has been a somewhat frustrating experience. I got the Gimbal shipped a few months later and I was excited then too. It functioned fine after installation. I bought a P3 Pro about 6 months after the Solo. For just going out and getting it in the air to shoot some video or a quick flight, P3 is SOOO much easier to get to the point where you hit the go button. I've been flying RC for over 45 years and have dabbled in scratch built stuff, electrics, also full size aircraft (pilot/mechanic), photography, and computers (built a few). So much for a quick background. My first quad was a Gaui 300 kit and I taught myself to fly quads using a Traxxas Alias - nice bird to get the basics down, I modded a Blade 350QX with an external GPS antenna, longer legs, coax receiver antenna mod, and added a Chinese gimbal for my Gopro. It made me want for more, hence the Solo and the P3.
The Solo is a science project to get into the air, no quick dash out to the backyard to video a flock of passing crows with this bird (but I did just that with the P3). I use a Nexus 7 (2013) with both my Solo and my P3. With the P3 I power everything up and the Nexus app automatically connects to the bird, every time. With the Solo, it is a crap shoot. I just did an update on the Solo firmware (I will give 3DR high marks for this operation, it is easier than P3 to update) and after it would not connect to my Solo App (this is typical). So I tried the iPhone and it connected OK. I use the iPhone as a troubleshooting tool, easy to determine it is the Android, not the Solo acting up. Typically the first thing I'll do after a reboot doesn't fix the connection issue is delete both the Solo app and the 3DR Services app off the Android and reinstall. Usually solves the problem. The other issue has been waiting on GPS satellite fix. Can be a few minutes, can be 10 minutes (especially if I've moved from the last flight to some other location). Now you see a clearer picture emerging, by the time I fuss with reboots, frequent connection issues, waiting on GPS, I spend a good portion of my Solo time standing around fussing with the equipment and the battery is at 90% by the time it is in the air.
The latest firmware from DJI, pretty much replicates the camera functionality that was a discriminator on the Solo when it was released. I use a GoPro 4 Silver with my Solo, but it pales in comparison to the 4K video from my P3. The P3 is rock solid, no shake and crystal clear compared to the Solo (and yes I have balanced the props). The props on the P3 were really good right out of the box. I shoot 1080p/60 fps on the GoPro and it isn't as shaky as the 2.7K/30fps setting (but it still shakes). Looking at the 4k video from my P3 is a wonderful thing on my 5k iMac. I am going to open up the Solo to make sure gimbal cables are not touching isolation balls and I will be doing the GPS insulator/spacer mod. I shouldn't have to do these things, with the price of these birds being what they are. Bottom line, if you like crystal clear 4k video and want ease of use P3 is the winner. Long term, I suspect the open platform Solo will get some upgrades and 3rd party attachments that will continue to grow it. The updates on the P3 are not quick to install, but I have found you can wait for everyone else to experience the bugs and get a later version, P3 will allow you to fly on whatever version you've got loaded. I've got a FPVLR antenna mod on the Solo controller and a pair of the parabolic copper antenna reflectors on my P3 controller. I haven't taken them to max range yet, but they have gone out of my visual recognition range without any issues (read that as I got it turned around and back home OK). I'm not as fearless as some who fly further. No crashes, no loss of signal yet. Sorry for the longish post, but both the Solo and P3 have their strengths and weaknesses and with the latest drop in prices on both are worthy of purchase. WRT my limited experience with 3DR support, they were responsive to the emails I submitted within a few days. I have no experience with DJI support yet. Have not tried the P4 yet, waiting for everyone else to find the bugs

. Good luck, happy flying.