I volunteered last week from Estonian Air Copenhagen-Tallinn flight and received 115 USD in cash, confirmed seat to next flight, overnight say at Radisson SAS hotel, two meals, survival kits (my bags flew to Tallinn), free phone call and taxi vouchers to and from hotel.

After arrival to Tallinn I asked (just out of curiosity) why compensation was 115 USD and not 150 EUR as it is supposed to be, and OV paid me difference between 115 USD and 150 EUR.