[Sprint Samsung Galaxy S 4 Android Development] JesseAaronSafir:
Before the MF9 update, I tried pretty much all the ROMs for the SPH-L720 and my favorite one so far was this one (Premium ROM). Because I was curious to try the latest and "greatest" stuff, I have flashed the stock rooted deodexed JDQ39.L720VPUAMF9 ROM with the stock MF9 3.4.0-953334 kernel. I added the 4-in-1 reboot menu MOD and the Hotspot MOD. I also added XposedInstaller_v2.1.4.apk and NottachXposed_v12.apk plus ViPER4Android FX v2.2.1.0 with the A8 driver. I was unable to get any version of 3Minit Framework working on this stock rooted MF9 ROM, even with just the SystemUI.apk MOD included. They all resulted in bootloops.

But as it turns out, nX is giving me pretty much all the MODding I need. I have my battery as text only with battery icon hidden and I have a small AM/PM indicator. Long-pressing the back button force kills for foreground app. Long-pressing volume up skips to the next track, but only with Google Play Music and not with my preferred music player "Music (Remix) by hedami". I was able to re-arrange the QuickSettings tiles but I cannot find a way to add or remove them like I could with 3Minit. I do miss the Torch toggle. But nX does allow me to long-press the brightness slider icon to toggle the torch, which is almost as good. Double-tapping the home button launches Camera, which I like. As I don't like the TW launcher, I use Nova Launcher, which gives me the feel of stock/CM/Trebuchet that I prefer.

I've removed most of the Sprint, Google and Samsung bloatware that I don't want nor use. I use Google Voice instead of Voicemail/Messaging except for sending/receiving MMS messages. I have HeadsetIcon installed to put up a Beats Audio icon in the notification area when I plug in headphones (like my Evo 3D did on Viper3D) and when I tap that icon, it launches my preferred music player, which is convenient. Though it's a little redundant, I also have "Mappz Quick Settings" installed to give me AOSP/CM-style Quick Settings tiles as well (when I pull down in the center). There's a Torch QuickSettings tile in there as well as a Battery QuickSettings tile that takes me to the battery usage screen.

On ANY ROM I've tried on the SPH-L720, I've not been able to get V4A working consistently. It does work, but only intermittently processes the music. I think I may have discovered a trick though, which is that if you start playing music on one player (and V4A is NOT processing) and then you start playing music on another player, it seems to make V4A start processing on the 2nd player. It seems to work in both directions so it doesn't matter which player I start first. Still, even with yesterday's release (v2.2.1.0), this intermittent V4A processing continues to be a MAJOR source of frustration for me with this device.

I continue to feel what I said earlier that MF9 seems to have worse battery life than MDL did. I was getting about 24 hours runtime on MDL whereas I'm only getting about 10-12 hours runtime on MF9. That's REALLY not good. The phone seems to indicate that the screen has been using the most battery but it's on "Auto" and not going very bright. Incidentally, I've found on this phone that most of the time I prefer full-brightness and anything less than that seems too dim to view properly. That being said, I was getting about 24 hours runtime on MDL with brightness at full and moderate usage. I may go back to "Premium ROM" to see if battery life is still great on it. I'm not sure if it works fine after updating to all the MF9 firmware/modem/etc stuff?