The Moderators or Admins do not get involved in personal disputes which arise from exchanges in the Personal Ads sections. Therefore, please make sure you are content that you have covered 'all bases' before exchanging goods or monies. The sections run on trust, please help to maintain that by being honest in your transactions.
To help your sale go more smoothly, it is recommended that you post photos and prices in your first post. It is no use saying "I have twin 12s for sale, make me an offer" because the price will be dependent on age, condition, tested/untested, O2/not O2 clean etc.
The Member's Charter covers conduct in this forum, so if in doubt, have a read of that...