If you have a TV with SCART sockets, but there aren't enough to connect all your equipment, this Hama unit might solve the problem.
I bought one of these Hama switchers in early 2006. I had a DVD player and a Freeview set-top-box, both of which needed to be connected to an RGB-enabled SCART socket on the back of my TV to ensure best picture quality. (It's a standard TV that I've had for some years, so without Component or HDMI connections, RGB's the next best option.) The problem was that my TV had only one SCART socket that was RGB-enabled. Enter the Hama AV-100S. This unit supports RGB, whereas some SCART switching boxes don't (so you'd end up watching the lowest quality composite signal, even if you've selected RGB on your DVD player).
So now both my DVD player and Freeview box are connected to the Hama switcher, and at the press of a button I can choose which of these to watch on my TV via the TV's only RGB-enabled SCART socket. Problem solved! And better still, although the Hama unit does not have it's own power supply, I can see no noticeable drop in picture quality or brightness by connecting the equipment via this unit (as opposed to connecting them directly to the TV).
Note that the switching on this Hama unit is manual, i.e. you need to get up and press one of the buttons on it, as it won't switch by itself. Also, this unit doesn't include any SCART leads, so you'll probably need to get one or two of those as well (preferably "fully wired" - many of the cheaper SCART leads don't connect all 21 pins between the two SCART plugs at either end of the cable).
In summary, I'd say the Hama AV-100S is a high-quality, sensibly-priced unit that solves the problem of not enough SCART sockets far better than other SCART switching boxes.
P.S. This Hama switcher has additional useful functions, though since I don't use them I haven't commented on them. And at the time of writing this review, the Amazon price for this Hama unit is around £10. That's a bargain considering I paid double that!