Just found this forum and find it very interesting. I have 5 SEMCA Machines bought in South Africa. They have 2 three stage motors and a 60psi solution pump (not the greatest pressure but good enough for my purposes). 2 of the machines are 3 years old and 3 machines are 1 year old. They are very reliable, and in my opinion very effective. Not 1 machine has been in for repair and they are used every day.
Having said this, I am now upgrading to a Prochem Everest HP (for no reason other than to reduce setup time). In SA we are fortunate to have a reasonably cheap labour force and thus we use as many machines in a house/office as the electricity can take. However this means lugging 40 kilo machine up staircases, which is a problem