I have used most of the systems and if done well look great and if you are the main contractor for the job you can make excellent money.
The problem is that all the sto jobs here in Plymouth are huge so only the big boys get the work who have the men on board and most of them do a s**t job.
They have some right weird systems, last year I was working on a sto job where were were sticking rockwool bats to the exterior of the building using a special adhesive like dot and dabbing but on the outside, then basecoat and mesh then final coat ....