I just recently joined this forum after reading this thread while surfing the internet for "aquarium cleaning".
I was rather taken aback by the answers to this question as it is obvious that knowone really has used this machine nor bothered to research what some aquarium professionals think of it either (sorry to sound insulting, however I am really bugged by anecdotal information).
This machine is popular with aquarium service professionals (which is how I found out about it) where products that do not work are quickly discarded.
With this machine you can change out only 25% of the water (so a to not cause osmotic shock due to large water changes) and the CONTINUE to vacuum the tanks removing as much organic mulm form the tank as possible that otherwise lead to high DOC and poor Redox. This mulm is removed simply by cleaning the micron filter when finished (unlike a standard filter that is run continuously).
Also, as to the micron cartridge, I have rinsed these over 25 times in a bleach/water solution and then reused the cartridges (which keeps this end of the operation relatively inexpensive.
Considering I have built my own Python style gravel vacuums for my aquarium maintenance business long before these overpriced Pythons became popular, I can state emphatically that these Cleaning Machine go well beyond the Pythons in what they can do (realistically comparing the tow is like apples to oranges)
For a small FW aquarium I would say save your money, however for a tank over 60 gallons or for multiple aquariums or especially for marine aquariums these machines really pay for themselves.
have you used it?
I am curious as to how well it works.