I do the 65k monthly method and make sure I have the FTT code for each transfer. My bank account is Bangkok Bank and I got my 12 month statement and guarantee letter yesterday (confirming 12 transfers each with FTT and over 65k). No problems and very pleasant service. I have to remember to transfer from my UK bank in GBP to get the FTT code. If I transfer in baht I get a Bahtnet code because of an intermediary bank, and immigration won't accept it. Its so annoying that different bank branches have different "rules", same as different immigration offices. Every year there is some new "innovation" to the systems, need for health insurance, stricter TM30, no embassy letters etc. Still, this is Thailand and its still worth the hassle.