Hi Shorty,
Thank you for the kind comments, just trying to share like so many other do here.
I am sure either machine will do a great job for you, the flushing ability on a SD is great. As one who has used the Classic for 7 years and a Cimex for 34 years, I can assure you they will do a great job in combination.
I use my Cimex on every carpet I clean. I pre-spray the carpet after pile lifting and vacuuming and then I use a solution in my Cimex and shower feed it onto the carpet and use Nylon Scrub brushes, this really does a great job of soil suspension. Then I simply flush it out with the SD and then finish it however it is needed. This is a great combination and one I am sure will do a great job for you.
I carry these up and down stairs and use it under all types of conditions and feel I have pretty good success. I am sure you will find this works great and will not need your truck mount for these types of flushing your carpets after they are scrubbed.
I have always used drag wands so it seems simple to me to use. I am sure it will take a little use to get comfortable with but it is a great system to use.
I would be happy with either machine but as I stated my real life constant use is with the Classic and I just do not have the day to day experience with the XL units. As for turning, it is a simple thing to learn to turn a unit and go the other way but this is much more practical to do in a larger open area, small bedrooms would not logically need this type of rotation.
As for a 15 inch or 20 inch, I would definitely use the 15 inch in a setting like you speak about. I have used 16 in and 20 inch drag wands a lot through the years and it takes a large setting to manipulate a 20 inch machine. Commercial it would be great, in a residential setting the 20 inch would be pretty big to move around.
I hope this helps a little and hope it is not confusing. If you can take a 19 inch Cimex upstairs, a SD will be simple to take up. Rarely do I ever have to use over 50 feet of hose on the SD, this makes it easy to use and work with. Like so many other tools we have at our disposal, this is another one that may help. Also, with the price of fuel, it is a nice additional system for most to consider, it will tend to pay for itself in savings, IMO.
Shorty, these are simply my thoughts and beliefs and experiences with the use of these items. I am sharing what I do and I like this set up, it works well for me. I just hope it will be the same for you if you decide to get a SD, I would hate you to get one and not like it.
Take care Shorty.
SA