New Products - move or stay put?

[#1]

I'm currently paying £22  for the legacy Premier Plus product. This gives me
1. Unlimited downloads 00:00 to 15:59. 20Gb download limit 16:00 to 23:59
2. Free domain hosting for 1 domain - I use this for my main email address and also my website
3. Space on the CGI server which I also use
4. A static IP - which I'd like to keep
The service has been very stable apart from the spam problems(s) which affected everyone. So I'm currently happy
BUT
its looks like I could get the same and save money by swapping to PlusNet Unlimited. I'd get 3 months at £11.99 and then pay £15.99 monthly  as I'm in a 'Market 3' area. I'd have to sign up for 12 months.
Anyone like to share their experiences  when changing products. Are there any benefits to staying on the legacy package I haven't thought about?

[#2]

The main differences for yourself would be a contract of 12 months, instead of 1 (unless you have taken any discount) and the traffic management. You can compare the products here http://www.kitz.co.uk/isp/plusnet_shaping2.htm

[#3]

yep think thats all the diffrence. i think moving domains over to unlimited is auto now but make cs aware you want to keep them to make sure.
new customers to plusnet do not get these extras any more.
@adiewoo. have you bein switched to unlimited yet?