In their own way they are often as self centred and disagreable as ebay.
1. The site does fail from time to time.
2. You need to list as a SELLER in order to accept larger sums. The catch then is that you find you CANNOT BUY sometimes as your balance between selling and buying is out of kilter and so by definition as a seller you cannot buy more than you have sold!!! So I asked them how was I supposed to use Nochex to restock. They spouted gibberish and blamed the FSA regulations. Ballcocks I say.
3. It is very expensive to use if you keep putting in and taking out small sums as the min charge is £1 so let it accumulate. If you are a registered SELLER and then pump in a large balance you seem to fall into 2. above.
Overall, when it works it's OK if you have the sort of disposition that can tolerate inane logging-in procedures.
PS. Owned by HSBC by the way. So it's secure and you can always complain to the big cheese if desperate.