It is a full-on dealerships/workshops kit - Rheingold Ista-D and Ista-P, Subaru also have one but it's impossible to get afaik.
Majority of it is firmware databases for all the F-series vehicles and I think the latest versions will have G-series in it too. Plus you get model related workshop manuals/how to's/diagnostics and troubleshooting. It basically tells you what and when to do in a rather easily digestible way. You just need to know where to look.
I was playing around with the self-levelling suspension module - you can go into troubleshooting mode and make it to raise/drop each corner individually and both at the same time, it can show you how many mm each corner is off the recommended height etc. Makes your life much easier when troubleshooting.
Basically a good way to save yourself a dollar or two on visits to the dealership.
E-sys is another piece of soft and mainly used for codding. From basic software level options like DRLs (how bright, what lights will act as DRLs i.e squid rings only or/and low beams or/and fogs, front only or front+rear etc), enable/disable all sorts of beeps/gongs/other annoyances, sensitivity of rain sensors to more complicated codding of retrofitted/upgraded hardware like LED dash panels or LED headlights.
Going to have a look at Alpina TCU flash, apparently gives faster less noticeable shifts and can go all the way up to the 8th gear in sports mode (stock only goes up to 7th).