Used SMILE domestically as opposed to Thai Airways internationally for years. Never had a cancellation or problem. Most recently Phuket-BKK, BKK-Udon Thani Oct 15. Booked thru Skyscanner.net and noticed each of these flights was £10 cheaper if booked as a Thai Airways flight and not Thai Smile; same flight though. I also prefer Suvarnabhumi to Don Muang which is usually more crowded and chaotic. Immigration also have a bad reputation there although u dont deal with them if flying domestically.
Haha! Oh sure! Those damned end users not understanding the wonderful IT system that we have designed for them! The priority for those working in IT should be the end user; to make the system as user-friendly as possible for the end user.