Mining
As a miner I would not put much value on the SOOTO buff. It most likely does not affect your TT returns and will not noticeably affect your average markup either (we're talking a fraction of a percent increase at best). That PED is better spent upgrading your equipment (drill, refiner, finder, etc).
I'm not too familiar with what the new SOOTOs (nanites?) are worth nowadays, but unless MA/Arkadia adds a more frequently available SOOTO with a very strong markup, this simply isn't a buff worth paying 10k+ PEDs for from a pure mining perspective. The speed buff it gives is arguably more useful than the SOOTO buff as it lets you cycle PEDs much faster planetside. The skill gain buffs are nice as well.
The most valuable SOOTO in the game is the small chance of finding a modified/improved/adj excavator or adjusted refiner via mining on Calypso. Unfortunately there is not much markup to be found on Calypso, and you will bleed PEDs fast using a big amp (which most uber SOOTOs are found with). Not worth chasing this dream.
There are some SOOTO with very high markup (angel scales for example) but a 25% increase in this extremely rare find is not going to affect your returns in any meaningful way. And neither is 1 extra mah'ketta shin guards every month.
Back in the day when Liakon was still lootable, this would have been nice to play around with
Also remember that this ring has even less value to pure indoor miners. I've never found a SOOTO in any indoor location aside from FOMA, personally.
For a
pure mining perspective, I would put this at Perfected Hermetic Price + maybe 6k PED at most. For hunting, I have no idea.
However this is all just speculation. MA can be tricky with words, and we won't actually know how this ring works until someone provides a large sample size of data/testing.