Yeah, well not my experience. I have Krungsri. BKK and Kasikorn (since it was Thai Farmer)
I have had easy efficient service on day of extension at both Krungsri and Kasikorn. Both were great, but lines are (in my experience) much longer at Kasikorn.
Yeah, I've discussed it there, but no real need to discuss it because it's pretty easy to calculate when rate margin exceeds the flat fee for the Swift transfer.
For 65K a month TW is great, but for large transfers? Not so much.