I'm a little bit new to all of this myself, Sedum. But I think I can help with your question at least


 Bitcoinexchange's rates are determined by the website Mt. Gox (mtgox.com). Right now Mt.Gox lists the last value of the Bitcoin at $29.95 USD, giving the Bitcoin a value of about €20.54 at current. However, as most folks know, the value of the Bitcoin is ever-fluctuating. At the moment, it's going mostly upward! But it can go down as well. So the value of the Bitcoin really changes day by day, but Bitcoinexchange.cc always exchanges by the value stated on Mt. Gox when your order is placed.

Also, Bitcoinexchange.cc seems pretty back logged with transactions, and if you trade through them right now it may be a bit of a wait. Paypal recently made an attack on them, suddenly claiming the sale of Bitcoins to be against their policy. So BitcoinExchange is currently out over $5000 worth of pay outs thanks to Paypal's poor business practice !

On the plus side, BitcoinExchange has tons of solid feedback on these forums, and though they might be having some issues beyond their control right now, they appear to be good on their word. I placed my very first BTC transaction ever with BitcoinExchange last weekend, and while I am still waiting, they are professional, communicative, and are doing their best to serve people as quickly as possible. Just don't expect anything fast at this time (I'm sure once the Paypal fiasco clears up they'll be running normally again)

hope that helped!