I wrote a positive review of this service last year which I now will revise to "Thumbs Down"!
One can no longer count on a 20 passenger mini-bus. My last two previous trips from Jomtien, while I paid the full B180 bus fare, a packed van showed-up: "No have bus today!"
Not a pleasant ride. Also, I had specified getting off at On Nut which is listed as a stop. The driver refused to stop there, going ahead to Ekkamai.
I tried again yesterday. This time a mini-bus did show-up. Packed with people and baggage. There is no baggage storage bin below the mini-bus so the bus aisle is packed with bags, in this case, many very large bags making it very difficult to get to the only empty seat, the rear-most bench seat. One also realizes one is trapped there should anything go wrong. Not a comfortable feeling
The bus took the surface, truck route all the way into Bangkok, making it a terribly bouncy, nearly 3 hour trip. I think I had more air time than seat time. The driver did stop at On Nut as I had requested but getting out was like climbing a rock-fall. Never again! I'll go back to taking the airport bus from FoodMart then get into Bangkok using the rail link.