"Does anyone see any benifits to agreeing to this transaction?"
As Clubman say, do seek professional advice. Broadly speaking, the tax implications are the same as a normal bog standard sale/purchase sitaution so no CGT for you on the disposal of your property and stamp duty on both properties will be payable by the purchaser of each at full market value. There used to be an allowance so that stamp duty was only payable on the difference but that is long gone. Make sure your prospective purchaser is not making any incorrect assumptions in that reagrd.
The BIG benefit for you is, hopefully, concluding a sale of your property in what has been an uncertain market. And if the exchange house is one that suits you, then its a win/win situation.
mf