If I use Possession on a unit equipped with Guardian Angel, do I benefit from Guardian Angel's replacement effect?

Ruling: Yes. When you gain control of a unit with Guardian Angel attached, the gear remains attached and its effect text remains active. If the possessed unit would die, Guardian Angel's replacement effect applies automatically—the gear is killed instead, and the unit is healed, exhausted, and recalled to your base. You retain control of the unit because it never actually leaves the board.

Sequence:

• Guardian Angel is killed and goes to its owner's (your opponent's) trash
• The possessed unit is healed, exhausted, and recalled to your base
• You retain control of the unit because the replacement effect prevents it from leaving the board

Nuances:

• Your opponent retains control of the Guardian Angel gear itself, but you benefit from its replacement effect because the effect is mandatory and applies to the unit you control.
• The gear's effect text remains active as long as it is attached, regardless of who controls the gear.