'i prefer Ebay, the market is so much bigger, as others have said wait for £1 selling fees, I opt for a buy it now with offers, you can set what offer gets forwarded to you, I recently sold an Ashdown 500 ABM EVO III for £200, the asking BIN price after Ebay had turned down various bids of £150 to £170 on my behalf, I don't think I'd have got that price anywhere else.
I don't like Basschat for 2 reasons, the £7 upfront charge whether you sell or not and I don't like selling to people I know and I feel I've got to know quite a few on here, not personally, but well enough not to want to sell them anything, if that makes sense.