Anyone use HP Tuners (or maybe others) and can share some maps?

I'd love to see a timing map for the early 5.7 if you are willing to share. My understanding is the factory ECU had two maps, one for normal driving and one for WOT. Like you, I have the old school aluminum case MS3X. I actually built it too. Pretty sure my eyes wouldn't allow me to do all that board level soldering these days... I've considered upgrading to their newest products, but I don't have a valid reason to do so. I do however, want more inputs so I can install a 3 axis G meter.

Sure! I don't have a problem posting up what I've got when I get home later today. I'm actually more or less running the stock ignition maps on my car now with some slight tweaks around idle for my cam. My most recent change was trying to emulate the "closed loop / open loop" that the OEM setup does, even though it's technically always closed loop for me since I have a wideband O2 sensor. I have mine set up to switch tables at ~80% throttle and it's pretty noticeable. I do think that it might be missing a little of the nuance of switching that the OEM setup has, but it seems to work well enough. I know they have a tip in feature that pulls some timing on throttle hits, but to my knowledge there's no real good way to implement that on the MS. Think of it kind of like accelerator pump control, but for ignition (though it takes timing away instead of adding it in most cases).

I know what you mean about swapping units too. I've debated going to one of the sealed solutions several times as it would be nice to move all of my engine stuff into the engine bay instead of the passenger compartment as it would drastically cut down on the number of cables I have to put through the firewall. I'm actually planning to put a G meter on mine for the fun of it if I ever get around to building my center console though. You can do it on the old setup via CAN fairly easily. I'm currently running GPS into mine via my Raspberry Pi. I use the Pi for navigation already, so I just piped the signal into the MS while I was at it for the fun of it. Was planning to do the same with an accelerometer once I get it installed. I'm essentially just emulating a JB Perf board with GPS, RTC, and accelerometers. You would need something to take the signal from the accelerometer and convert it to CAN, but you could do that with a cheap Arduino or Pi Pico or something for just a couple of bucks.