Samuel Fila ~ Both websites are perfectly valid and official...I happen to like showing the "thai-elite" version since it has a nice chart at the bottom comparing the various membership options and perks, while the version you like sharing, does not. Both are secure and free of any viruses ;-) Cheers!
In over 12 years of membership, I rarely had any problems. One time there was confusion @ the Chong Mek crossing near Laos and I just called the Thailand Elite hotline and the problem was solved in a coupe of minutes. Very easy :-) Plus a supervisor is always around as well.
Thailand Elite HQ can make the arrangements to extend your stay by contacting the Pattaya Immigration Office, but they do not have Elite Personal Assistants to assist you, as they would at Chaeng Watthana.