if you want to upgrade to skyHD it's deffo worth it for the extra content you do get

but only if you are watching telly all the time or there is someone who is at your gaff

it's the difference between watching video and dvd, but the next level upwards and i'm glad i got it

regarding your problems with channels 1 - 5, it might just need a reboot of the box, there is a sequence of buttons you need to press to get the box to reinitialise itself and start from scratch with the tuning but i'm not sure if this will wipe the hdd or not