I don't believe you need to pay for internet security. I have just read a review of this and it is not as efficient as it should be.
http://www.pcadvisor.co.uk/reviews/index.cfm?R eviewID=269
I also do a lot of internet banking with different institutions but believe I am as secure as I can be.
I suggest you have a read of this page, and consider downloading the free security from the links:
http://cgi3.ebay.co.uk/ws/eBayISAPI.dll?ViewUs erPage&userid=cuddly-hippo
I use ZoneAlarm and AVG, and also run adaware, ewido, spywareblaster, A2, Ewido and Spybot regularly.
The most important thing is to make sure all security is up to date, otherwise it is useless.
But if you prefer to pay, then the offer seems good and the product is reasonable.