Did 300m through etransfer, got him to buy me a couple items then the rest cash for quality assurance. Seems like a solid trade & time wise it was pretty quick considering 30 min transfer wait time, would recommend.
Another vouch for Secnx! Sold 15b RS3 gp to them this time. In total I've sold 120B RS3 gp to them in the past year and a bit. All of the several trades have been great.