These Roku internet TV box thingies, anyone used one or similar?

Roku Box thingy website

Keep getting the advert popping up on the side of the screen here.
I don’t really like to watch scheduled TV, only stuff thats been on whenever I like so thought these may be good instead of firing up the laptop.

Has anyone used one of these? Worth having? Can you fit it to a relatively old telly?(which has Scart connectors)
Are there any good alternatives?

I saw that, & thought ooh a cheap apple tv, I like.

Did a bit of research & decided it was less powerful than my ps3… so I’ll stick with that.

There is quite an indepth review on cnet…