I had a F16 30d and now drive G05 30d. The G05 drives smoother but has a little less exploding power but I think's it's overall faster that a stock F15/F16 30d. But maybe it's just the smoothness of the G05
My F16 was chiptuned, and all previous BMW's, it went from 258HP to 310HP and from 560NM to 650NM. Never had any engine problems and warranty problems. The engine is tuned conservatively from factory and tuning is well within limitations of the engine.
The G05 is a loaner for the moment but when I have the 45e I will let it chiptune again. Figures are 394HP to 500HP and 600NM to 800NM.