Hi mate,
There are many people who hve positive experiences with lpg installs and many like me who has hd bad ones. To go with this there are many pros and cons. With a great install I am sure LPG is worth it however lesson to learn as I have done, you get what you pay for, if it is too good to be true then it is and if it is very cheap to install then it could be because the installers are rubbish.

My advice is research on lpg, see if u are happy with the boot space loss, having to wait ages for the lpg tank to fill at the station etc etc and if you want it, find a place that you have heard off and have been recommended by. My chrysler/land rover garage recommended me to this new lpg place where I am getting a report and repairs of this shuddy lpg install I have. Chrysler and land rover wouldnt recommend them if they were bad as it could effect their reputation as well. Just an idea, perhaps ask around. I have been told now to always use a place that is either approved by autogs/uklpga. Hope this helps