Even the price on the W220 is good - goes for about $140 elsewhere.
Base is not a fantastic brand but for a dollar, it could be a great stocking filler.
The W220 is a prepaid Telstra. In previous deals with the prepaid mobiles they are usually locked to the carrier. But usually only for 6 months. To unlock in 6 months costs $50 and $27.50 after.