THe service is good but it is severely throttled for Usenet and P2P.
The Virgin Usenet is useless really hardly any retention.
Try Giganews Diamond service, comes with a boat load of free add ons and half price at the moment, almost 1000 days retention and 50 Connections.
I would check the upload speed as you might not live in a 5Meg enabled area at the moment.
Its a reliable service but I would consider if you really need 50Meg, if you are getting it for Usenet then you can only really use it at full speed after midnight and between 10am and 3pm.
You do have no real limit to how much you can download unless it is excessive to the point of you downloading more than a whole street.
Your upload speed is regulated to a max of 6000MB between 3PM and 6PM, if you exceed this usage then you will be throttled to 65% of your max speed for 5hrs.
Some people think that using SSL will get you around this policy but it doesn't really work and Virgin are now monitoring port 563 so it wont be long till they tie this down as well.
We have the Power lets take it back!!