I'm on the same package as you and to be honest I can't fault it - though their customer service leaves a lot to be desired.
My brother discovered that just because you do a line test and it tells you that you can get up to 8mb speed doesn't mean you'll get it.
There are a lot of factors to take into consideration re the speed - how far away from the exchange you are and also the age of your phone lines. Our phone lines are pretty old and I just don't think they can cope with the demand.
My brother was originally on the 8mb package of the same ISP but he never ever got 8mb - in fact most times he was lucky if he got 1mb. He changed over to his TV supplier and they told him that although the test on the computer showed he could get 8mb, his line wouldn't actually support it, so he's on a 2mb connection with them and it's been OK.
If you have your TV through a satellite dish (I'm guessing here that we're not allowed to post up company names), their package is actually quite good and you get a free router with it. Only difference is that they are capped at a 40gb monthly download limit.
Dunno if that helps or not - but in short, I'd stick with what I've got!!
Alison