Good for the CV, bad for you.

I enjoy examining, but the Almaty centre was terrible.

Negatives - you have to email all these different people about different things, if you email the wrong person they don't reply or pass on the message. The local and foreign staff don't speak - huge breakdown in communication - likely due to the local staff and cultural problems in KZ.
So much paperwork to get your money back.
They paid me wrongly and took three months to pay me. I did two months of work, sent the documents, waited and waited, then they emailed me my hours (which were wrong and about £15 off) but I couldn't be bothered to get it back and just took what I could.
They didn't give me a hard certificate, which other companies and BC offices have asked me for - unsure whether this is normal or not.
My only proof of passing the examining tests are the emails I received.
They send you two dates for each exam - the dates the students begin the IELTS tests, and then the date of your speaking exam - stupid and confusing system.
NO VISA OFFERED!!!! I wanted to stay, but examiners can't be given a visa, so I had to leave and lose my certificate (or lapse as they call it).

Positives - you can become an examiner, and they will give you regular exams. You get some good feedback, and the other examiners are friendly and happy to help.
You get paid fairly well.
You can choose your days and hours.

Overall, it is OK. Worth the experience for your CV to be an examiner, and good to put the BC on there too - very well-known company.