I’ve not bought anything on the forum, but I’ve sold a few items and have never had any problems.
Good communication is essential for a smooth sale. There is no excuse for not keeping people updated either via here, e-mail or phone.
Once I’ve had a confirmed sale with someone, I always give them my full name, address, mobile number and landline. I think it’s important to have a point of contact apart from STW.
I also tell folks when the item will be sent out and then e-mail a photograph of the proof of postage once its gone.
I also only ever send out using recorded or special depending on the value.