As long as Vemstune has compatability problems with (eg Prolific) USB to serial converters it cannot, in my view, be considered even as an equal to the old, clunky and above all RELIABLE Megatune.
I simply don't care how fancy (and good) the interface and innovative tuning helpers have got if it fails at square one - simply talking reliably to the ECU.
I really do like the features and tools in VEMS tune, but with reliability and connectivity issues, it's a non-starter for me unless I have an ECU on my bench-tester connected to a desktop with a real serial port.
Fix that, and I will delete Megatune from my laptop with pleasure!