Cost: 5/level
Good Grip was introduced in Toolkit 2 as a reverse to Bad Grip.
At 5/level to get +2 to climbing, it is cheaper than the 8 points it would cost at higher levels to advance the skill (but skills are brought over to new bodies, unlike physical advantages)
This is more expensive than the 4 points it would cost to get +2 via racial talents, but those do have a suggested cap of +3.
GG/BG influence things besides climbing. B123 specifies "melee weapon use" and "catching things" as examples for [[tasks that require a firm grip]], plus Acrobatics to catch a Trapeze.
So GG should give bonuses to all those things, which would be helpful for a low-DX person using melee weapons. There isn't even a cap.
Technical Grappling strangely does not mention it. Presumably it might affect Grip ST for grappling (the Control Points).
No Fine Manipulators already does (0.3xST instead of 0.5xST) and it is a more extreme version mutually exclusive with Bad Grip.