here's the link for the group. The DTV is becoming a little harder to get lately, more people are being denied or given a METV instead. If you truly qualify it's easier but the embassies, depending which one you use, are asking for more and more documentation due to people abusing it with 1 appointment or not attending classes. People are also getting grilled on entry but mostly being allowed in. Destination Thailand Visa (DTV)
there have been a couple of posts on various groups about people being denied entry on an METV when trying to enter just before the visa expires after extended their prior entries.