Right, I completed FE3H on ryujinx. That was a very long game so I figured I should write a summary on what the experience was like and what kind of problems to expect with the current state of the emulator.
Overall rating? 3/5, it's alright. The issues are mostly minor and I did not encounter any game breaking issues or other major hurdles that would seriously have hampered enjoyment of the game. The big upsides of playing the game like this (beyond the obvious) are the graphical improvements. I exclusively played at 2x resolution (~1440p?), with the 60 fps patch enabled and usually with post processing via Gshade (Reshade). The result is visually a much cleaner and up to date presentation compared to OG hardware. This game in particular has a fairly drab and desaturated look which I made much more interesting (to my tastes) with color grading/HDR, slight bloom, AA and sharpening. I posted some screenshots in that thread the other day. In practice a lot of the effects don't work correctly as they've been made with PC games in mind, so finding a good mix of effects was a fair bit of trial and error.
Obviously, there are hurdles. The most noticeable graphical issue is the glitched skyboxes which are immediately apparent, but luckily only really visible during battle animations, otherwise you won't be staring at the sky. Bumping up the resolution comes with a very modest nominal 5 fps cost, but this was measured when the emulated GPU pipeline wasn't hitting its limit - I suspect the difference is greater in those scenarios, but the only thing that would have made me consider dropping the resolution would have been game breaking issues and unacceptable performance. As it was, it wasn't always pretty, but it was certainly playable. Performance varied anywhere between 20-60 fps.
Now, crashes. I started with the POWER fork from May which I used for a couple weeks before updating in late June. Going from that fork to the latest version then resulted in a big reduction in random crashes, I would say in the range of 75%. I only ever remember encountering two mid battle crashes and these were many many versions and a hundred gameplay hours apart.
On the topic of updating to newer versions, it's a mixed bag. Updating that first time to a version that was over a month newer was definitely worth it as it brought stability and slight bumps to performance. Afterwards, not so much. I took a habit of updating every 2-3 days and found no discernible improvements, but instead new problems in the form of launch issues. The game would quite often refuse to launch until some combination of rebooting/launching other games/repeatedly trying would fix it. Also, I noticed some updates drastically reduced performance on the other games I had installed but wasn't actively playing. I'd say it's recommended to always back up known working builds when updating in case something goes wrong since to my knowledge there's no way to download old builds.
What are your PC specs?