The problem with LM is its seen by some as a lazy way to clean to give a quick fix - not capable of properly cleaning.
This is often the opinion of Truck Mounters.
Now before i go further, i use both LM and HWE and wouldnt be without either so i am not biased to LM.
I think the quick, lazier approach is actually more applicable to the TM jobs. It is very often expressed on here how much quicker and easier it all is with a TM and how much more work you can do in a day. Its also suggested its the only real way to clean properly.
Now this isnt a dig at Simon - but have a look at the photo of the minger he has posted in this thread. From what i understand Simon used a TM on that. From the picture i can see a number of things -
The carpet has probably been presprayed, but certainly not agitated - otherwise the uncleaned area would not look like it does. Was it vacuumed? - not sure.
The curtains are still hanging at floor level - not great when using a wand or prespraying or after as moisture will wick up.
The sofa has not been moved and is not on blocks and it has wooden feet - light wood yes but still a problem if not blocked. The carpet soiling also goes well past the sofa limit.
Although the carpet is obviously cleaner where its been wanded - you can still see areas that need attention and if it had been agitated properly first before wanding, it would look a lot better after a pass with the wand. It isnt as it could be.
Now, if that is correct, that means the process was go in, prespray and then wand - quick and easy with pieces of the cleaning pie missed out - often what is accused of LM cleaning when it isn't when done correctly.
My point is - dont compare just one method to another, it doesnt mean anything. The real thing to compare is the knowledge, dedication and appliction by one operative to another - that will vary from company to company.
To do LM well takes an expertise and a knowledge and to be honest is a real great way to learn more as you are restricted by what you can use without rinsing and can leave you with more knowledge about how things work because you have to dig deeper to know what will achieve the result but leave the carpet in a non resoiling state. Anyone can prespray and rinse super hot, but are those acheiving better results and giving a better service? - no, not always.
And this isnt a dig at Simon - but there can be a team of TM's on here who always rubbish LM when its possibly their own misapplication of it which actually is the problem.