Hi Tariq
I've had lpg systems on various vehicles over many years including 3 x LS430s and a LS400 and have had Prins,KME,Romano and ok haven't had experience of the BRC systems but the Romano ones, also Italian, have been faultless. The Polish KME injectors are a bit clackety which can be alarming at first but again have performed without issue.
Hope this helps
Tim