I'd much rather sell through MCS, whether by auction or consignment, than ebay. I haven't sold anything on ebay since 2008, so no comparison pricing.
Auction fees are 8%. If you use their buy it now (where you set the price) it is 10% for sales up to $300, 8% on portion after that.
What I love about it is that they deal with the buyer, not me. So far I've only had one time where a winner didn't pay.I had to relist and MCS banned the buyer, but compare that to ebay. On a buy it now they also list your item on ebay.