Sold gold to this seller a few times. His availability is second to none, and has quick response times as well as professionalism.
He was okay with lower amounts (~100m) as well as higher (~ 400m+). I went first (of course) and he sent payment via my method of choice with a very acceptable turn around time (~1hr down to just 5-10min once). He always tried his best to get me my payment as quickly as possible, which I appreciate.
Vouch for Secnx! Sold them 20B RS3 gp this time, in total I've sold 250B RS3 gp to Secnx over a timespan of under two years. I've always gone first and all the trades have been good.