Hi, new here but I have some ppg experience and product testing.
APCO split leg harness is 1.77kg with back padding. Without pockets and reserve container or airbag.
Now the others are from memory.
The SupAir evo is 3.2kg with wooden seat Board.
2.88kg with carbon Seat Board.
APCO slt 2.77kg with short wood seat with pockets.
Air Conception is SupAir evo made from lighter materials 2.1kg
Person size and seat size. The SupAir has the largest seat. Medium and large. The APCO slt Seat is much smaller and thevwood is thinner we have broken those. The split leg is very short in the leg and not ideal for long flights. For electric ppg such as this, it looks perfect.
APCO split low hang comes with a back up strap system to hook into your carabiners, should the weight shift fail. It is comfortable enough but there is a limit on pilot size. Small and medium pilots find it comfortable. Larger pilots not so much.
I hope this helps.