I got mine (Frostbite) mid December - and that thing is a gamechanger.
I mostly print PLA and PETG. For PLA i went with 35°C - and for PETG i tried 45°C. Both stick perfectly. I never had any troubles with PETG on the textured PEI Sheet from Bambu, but with small PLA Parts - or sharp corners with Warping - there were plenty of fails. But not on the Frostbite. Love this thing 
I miss the textured surface from the PEI Sheet - but the smooth surface from the Frostbite is also fine
I always printed PLA on the PEI Sheet with 60°C and with an open lid, because the chamber gets too warm. That problem disappeared. Now my lid/door is always closed. Less noise. Less “airpolution”. Less electricity costs.
And if the power fails (or if you turn off the power with a smart plug after the end of a night job, but the printer has already stopped for some reason), then the print is no longer ruined - but you can simply switch the printer back on hours later, despite the completely cold plate, and continue printing, as the model is still attached to the plate.