Decided to take the bus instead of NokAir(other discussion)
The yellow bus is pure shit. I'd not take it unless you have a need/reason to go to Aranyapatet(Poi Pet border with Cambodia)
I don't sleep on buses, so took the 8am bus to Mukdahan. Stop, stops, hot as the AC not sufficient. 14 full hours later in Mukdahan. There are a few cheap hotels at the bus station.
On the trip back, I took a VIP with one seat one side, two the other, to Mo Chit. Left at 830am. Comfortable to say the least, 10 hours later at Mo Chit. Transfered to a Pattaya bus within about 45min of arrival, back in the condo call it 12 1/2 hours later.
Both long trips, but the moral of the story is worth the extra dosh to go via Mo Chit. I'll edit in some links in Thai which may provide the schedule Mo Chit to the great North East of Thailand where nonsense such as "farang bars", "lady drinks" and "barfiners" are unheard of...you go to a traditional brothel for "sex" and mind your manners while mixing with the general public. No farangs in Tesco/Lotus without a shirt on etc..
http://www.transport.co.th/
http://www.adtechs.co.th/
This is what the bus looked like. I noticed they also had one from Mo Chit to Nakan Pranom(sp, the city basically the furthest northeast)
Cheers. Nok the Kook