The Manhattan Plaza DS100 is a basic, but quite user-friendly, Freesat SD box. If you have an old Sky dish still cabled up all you need to do is connect the screw-in plug to the LNB input on the back of the receiver and use the supplied Scart lead to connect to your TV. If you have a dish with a quad LNB this receiver would make an ideal option for satellite TV in another room by cabling a spare port from the dish to a bedroom etc. However, if you are starting Freesat from scratch you would probably be better off going for a higher spec receiver than this, one with HD for example.
The DS100 is easy to get up and running as it more or less does everything itself - all you need to do is enter your postcode during setup to receive the correct regional channels from the BBC and ITV. You then get your own regional BBC1 on 101 and ITV on 103 - however, all the BBC regions appear on higher channel numbers but if you want other ITV regions you will have to add them yourself. The other channel you need to add manually is Sky News, if you want to watch it, as it is not part of the Freesat package of channels.
The picture quality of the DS100 is OK, but not as good as some more expensive receivers - it's alright on a TV up to about 22" but any bigger and you will start to notice its limitations. The audio is good - but the receiver has no dedicated audio-out so if you want to connect it to an amplifier, for example, you will need to use an adapter from the second Scart socket. The box is very small - nowhere near the size of a Sky box - but represents pretty fair value for money for someone wanting a cheap subscription-free satellite TV option.