I did try to contact their customer services recently to get some prices, the stuff they sell seems ok (i did an installation recently and an intelligas interlock was in place, but without knowing the cost I couldn't comment further..
i fit s & s northern panels, they are good quality, not cheap but will pass insurance standards, I fit them in schools, care homes, restaurants etc no issues to report back, simple enough to fit. There's a few option with current monitoring if you don't want to fit pressure sensors to extract and fresh air ductwork, there is a great panel that combines both fan speed controls too but that cost me around £650
you will need a proving system if any of your equipment has no flame failure device / non-ce approved unit.
i hope may help answer your question.
Col