It is that easy, it literally amounts to
dumping unique drive key (all but the 7 series liteon can have this done with nothing more than a sata lead and a powered drive, the 7 series liteon needs a simple key you can either buy for the price of a game or build from basic parts)
using key to make firmware for drive (amounts to pressing load dumped key, load base hacked firmware, press OK to make new hacked firmware that includes keys).
Flashing said new firmware to the drive (selecting said new hacked firmware and pressing do it to it).
Where the "difficulty" comes in is that there are multiple drives with some possible subtle differences; the hitachi will need to be put into mode b (nothing drastic and it is covered in the link I gave earlier) and people who fail to read up can often skip a step or do something wrongly (mainly when we have to play with hardware but not unheard of at the software stage of things).
By "Silicon" I mean the people that make your sata adapter; if the base chips come from Silicon Images leave it alone and just buy in a sata card (the VIA 6421 series is a bit old now but still found in real world/mainstream shops), note these companies sell their chips to makers who then bundle them in hardware; think when was the last time you actually purchased an "NVIDIA" graphics card and not one with an NVIDIA chip but made by PNY or the like?
As for how to tell it can be tough, I usually find the drivers a good indicator as most of these companies that buy in chips will usually just slap a bad installer for an old version of the stock drivers together and call it a day.