I purchased this extension for the sole purpose of loading size and color custom options to my product catalog.
The import ran but my products were not being updated. I sent a request for help and my email was responded to in less than 15 minutes! The developer fixed the custom issue the next day. Then I discovered it would not work with multiple custom option columns. This was fixed the following day. The product does not seem to support sort order on option values, but I would double check with the developer on this.
So in summary, the product did not function as advertised but the developer responded quickly to fix it. So if you are purchasing it now to load custom options you should be OK due to the fixes made recently by the developer. I have rated the product accordingly.