Any chance you will start to accept Dwolla? I don't think it is any more risky than bank transfers that can be reversed within 60 days.
I suppose the answer differs depending on the country but I am quite surprised in any country a bank transfer (wire transfer/SEPA I assume) can be reversed after 60 days. In the US they cannot be reversed for any reason and I suspect the EU is similar, or at worst allows a reversal for a very small period of time.
Please be warned that bank transfers really can be reversed up to 60 days in the US. I have had to do this before with Coinbase when my account was deleted. They never processed the order for BTC, the account was deleted, and they did not dispute the charge back from my bank. This is an extreme example but it can happen.
In this case Coinbase probably refunded your money.
You cannot reverse a bank transfer after it is sent, received, cleared, and withdrawn. If the bank puts a hold on it before you take it out is different.
When the receiver gets the cleared money and takes it out the sender would not be able to get it back. Same way with Western Union and BTC.