Which cruise control ?

Any advice as to which one for my 2004 TD5 Defender. Any advice from anybody that have fitted one, as my knowledge of electrical/computer bits are sketchy at best. Terrafirma seems to be the most mentioned as per my searches. Also would it be best to stomp up the money to have it fitted ? Thanks.

Apparently you only need two switches and some wire on the later TD5, as the software is already in the vehicle.
You don’t need the £3-400 kit as it’s already in the ECU.
It can be installed using the column control and centre console switch from a Discovery 2.
I am planning to fit it to mine as soon as l have the switches.

Half a brick or the old fashioned hand throttle in the passenger footwell?