Damp proofing

Hey guys,

I was wondering if you guys would be able to give your opinions on Damp proofing companies up here in JHB. I just wanted to know you guys experiences and anything to watch out for.

I have got quotes from:
*Damp king
*SA damp and coat
*Dampcon
*Flick

Please also let me know if you would recommend any other company, which guarantees their work.

Thanks