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[brokenbat]

 came across this : https://www.kingsgrovesports.com.au/cricket-bat-repairs/bat-preparation.html

I think GCCC offer the same - where before the bat is even oiled, it is "machine rolled".. sounds like secondary pressing to me.

Has anyone had experience with this? My fear would be the bat becoming too hard-pressed and potentially losing some of its ping?

[well past my peak]

can't make a comment on Kings, but from what I seen at GCCC it's a joke and I would avoid.
Although it's only a light roll (perhaps it might roll the edges slightly) I would always oil a bat before rolling my edges.
Typical service from GC's= customer hands over $1500 for top of the range Indian made bat, 15 year school boy cricketer then will expertly press your bat because the batmaker hasn't quite got the press done right, oh no a slight compression crack has appeared, "oh sir the willow is a natural material and it's to be expected". yeah nah no thanks

interesting they would never re press/ roll GM's

[Kulli]

I'm pretty sure the 'pre knocked in' status of many bats is just an extra pressing.

[kvskpin]

No, No, No and No. Simply refrain from this. Irrespective of which grade of willow it is, bat makers are in the best position to press the bat just right. No bat maker would by design press a bat sub-optimally unless they are making a bat for tennis ball cricket, in which case, there is no pressing involved.
Whatever Kingsgrove or GCCC are doing is either not doing anything to the blade OR pressing the bat even more than bat maker, thereby resulting in a bat that will be pressed hard. The end result is a bat that will last long and not break, but then the sweet spot of it will be much smaller and the ping will not be optimal.