Another thing to bring up if you could; how does Biocompatibility (or indeed any grade ware above Standard) work with regards to implants that cost 0.1 Essence?
The question came up because of the wording of Biocompatibility, specifically this (emphasis mine):
In game terms, the Essence cost of implants of the particular chosen type are reduced by ten percent, rounded down to the tenth. This rebate is cumulative with the reduction offered by the chosen ’ware’s grade, if any (e.g., the reduction for alphaware of 0.8 is reduced by ten percent, or 0.08, to become 0.72, and is rounded down to 0.7).
An implant like Cat's Eye at standard grade is 0.1 Essence, which assuming the character only has Biocompatibility makes it cost 0.09 Essence which then by RAW gets reduced to 0. I'm guessing there should be a stipulation in there about a minimum cost of 0.1 Essence to avoid possible exploitation like this? Granted, with Beta and Delta grade ware being rare, it's still not impossible to get quite a few pieces of Bio and Geneware at potentially 0 Essence, which seems to run counter to the whole "Everything has a price" dogma of this edition.
ETA:
And I just noticed that it's probably the cumulative reduction that's supposed to be rounded down to the tenth, as per the example with Alphaware becoming 0.7 instead of 0.72, but the question still stands.