I've got both NTL Digital and Freeview. The NTL box ****es me off because it only does 20 MIPS, so is slow changing channel, using the guide etc. It's costing me almost £20/month for the standard package which includes sky1. It works 99% of the time without the picture breaking up. Interactive is slow and doesn't overlay the tv picture (sometimes a good thing as there is no "press red", but means there's no interactive game shows etc).
I thought i'd give freeview a go because if it works I was prepared to get rid of cable and save a few quid, even tho i'd loose sky1. I bought the little Pace DTVA box. It's a great pice of hardware, does 100 MIPS and is quick changing channels, using the guide etc. It picks up all the channels from my standard rooftop aerial with 75-92% strength. the problem is the picture does break up seemingly at random, more frequent on ITV which is still 64QAM (they havn't switched their signal to 16QAM like BBC which is better signal). When the picture does break up, it makes a horrible shreiking noise through my hifi speakers which can't be good for them. I changed the cable inside the house for low loss satellite coax joined with F connectors but not all the way up to the aerial because I don't like ladders! It did make small improvement but i'd have to get a new aerial to make it perfect I think, and i'm not prepared to spend another £100 having one installed. Pace are transmitting a firmware update on 11th Nov so i'll be able to see what interactive is like, it make even make the signal better. So i'm gonna stick with cable, and keep the Pace DTVA for the couple of free music channels for now, maybe ITV will be forced to switch to 16QAM by the end of the year i'll consider dropping cable again.