Unlimited Data - is it becoming a reality?

At the start of this month Vodafone announced they were providing Unlimited Internet Access to their customers.  Previously you had to pay £7.50 for a measly 120MB. 

This announcement now provides any customer who pays £25 per month with 500MB of Internet Access which isn't 'unlimited' - but should be sufficient for most people! 

If you pay £40 a month then you can get a choice of unlimited texts, unlimited landline or unlimited Vodafone to Vodafone calls!

Will this have an impact on Mobile Internet Usage?  I think so.... most of my friends outside of the industry don't dare use the Internet on their device due to concerns over what the potential charges could be... by adding in the 500MB bundle, Vodafone have made it very easy for people to start to consume the Internet on their device.

What are your thoughts?