@Init
If you have time to wait, wait for final 1.7 release of firmware of M92. Then you can judge, if it does
all you need. And if it is stable.
To my opinion even current 1.7 RC is satisfactory stable, the bugs that are in firmware do not influence
my work and I take them as marginal. (But they may be important and very unpleasant for other users or other types of utilisation...)
After that you may decide, whether 120 E extra is worth it or not. It is say 40 beers, so you may make good to your livers.