[Galaxy S 5 Android Development (Snapdragon)] mxz55:
I used this ROM until last week, when my Galaxy S5 plus fell and shattered, and I had to decomission the phone. I cannot help my urge to leave some feedback on my general experience with this ROM and the other LineageOS distributions by [MENTION=3419717]cvxda[/MENTION] that I used along the lifetime of my device. I believe that cvxda is one of the most experienced maintainers (or, Android dev) around and has kept this device alive and allowed me and others to keep getting the most out of this aging phone.

With each ROM from cvxda (LOS 14.1, and now 15.1 oreo) that I used, the experience was just like using a modern high-end (flagship) smartphone, something impossible to achieve with the stock firmware. The performance and interaction speed of any interface or app was smooth, lag-free and responsive. I believe this is to thank to the extended hardware configuration of the S5 plus (g901f), like the more powerful GPU over the standard S5 model, which cvxda's LineageOS ROMs leverage to the fullest possibility through optimization, which cvxda is good at in my opinion. I haven't been able to get this experience out of any other ROMs published for this device.

The dedication she is showing towards keeping development for this ROM alive, has resulted in approx weekly (full OTA) updates, LineageOS nightly releases. This pace of development has allowed significant improvements that I witnessed made the 8.1 Oreo rom (this one) evolve. The current (latest) version is extremely stable and through the most recent couple of updates, I only noticed one or two leftover issues, and the issue mentioned at the OP ('SIM may sometimes not be recognized') evaporated completely with a specific build update like over a month ago, it seems to have been completely fixed and atleast in my case never re-occured after that point.

The one issues that I had, which are also the only issues that I noticed with my intensive usage of this phone and ROM, is the camera hiccups (I experienced that the 'occasional hiccup' factor is that it only halts the camera app once, when you just booted the phone - simply close and re-open camera app once and it will not happen again until you reboot your phone) and perhaps the overnight power drain issue, which I haven't tried to reproduce to see if it was still present in the latest, say, 5 builds, so it may even be limited to that one issue. I also still had, up to the latest moment of the life of my phone, the issue with apps randomly not being able to issue push notifications (more like the ability to receive data or messages in the background.. just when opening the app or even messaging feature within it itself) and which I described in my earlier posts in this topic. I however think there's a chance that this is a (configuration) issue on my end, I tried changing some system settings but have been too lazy to perform a full android reset to test that theory out, so please don't value my account of this issue too much unless (until) others come forward with the same issue.

This is by far the most stable, issue-free and daily driver suitable ROM I have ever seen in my years running custom ROMs on different phones, the LOS 14.1 ROM from cvxda had matured and became basically without any issues, and now a while after she released the Oreo LineageOS rom, it has also started to become issue-free and stable like the predecessor. I am really amazed by the speed that cvxda manages to mature the project from initial release to utterly stable, yet continuing optimizations and updates without introducing too many (if any at all) bugs along the OTA nightly updates. I think S5 plus owners are very lucky to have a developer like this taking care of their device.