Although I haven't used LM products myself, I've generally heard good things about them. Since we're on this topic... I was planning to use a bottle of BG44K which according to BG's website, "Safely, rapidly and thoroughly removes engine deposits in combustion chambers, intake manifolds, ports and on valves. It restores flow in fuel injectors and cleans the entire fuel system". It does what Jectron and Ventil Sauber do in one bottle/treatment.