I just want to echo those thoughts of DL,
Liquidation (surplus) is an exciting market-space to deal in, but it is fraught with dangers for the careless and the clueless.
It's important to understand what you are buying in any dealings with any supplier, but none more so important as when dealing in this market. Never be afraid to ask questions, any decent liquidator will be more than happy to answer them as best they can, just don't get crazy with questions and ask something like are there any scratches on the dinner plates and so on.
Knowledge in this space is king. You can make out like a bandit at times and you can get burned to the ground at times, so you need to assess all the risks that are going to be associated with getting into this space.
As DL has mentioned, a lot of negative reviews in regards to all liquidators come directly from people's crazy expectations.
If you want to try your luck in this market-space, do your homework beforehand and really understand what you are buying, to begin with.