i don't mind air layer, but for me, rooting a cutting is much easier. if the branch i'm air layering is near the soil, that's an easy job. however, if the branch i'm air layering is toward the top of the trunk, it's little more tricky for me.
problem is making sure the weight of the air layer can be supported and stable so strong wind or rain won't cause problem like it did before.
for trade, i prefer to get cuttings and send cuttings. however, if the trade involves rare/valueble variety, i don't mind doing air layer.
pete