He - as the forerunner -
+ Is designed to be robust and of high quality,
+ Has a reliably working hammer,
+ Is easy to move and adjust,
+ Has a notch machined brass nozzle with reliable water distribution,
+ Does not generate a hard, outer water ring,
+ Provides good adjustment of the irrigation zone and
+ Stands firmly and safely in tight 4 bar water pressure.
There are voices that the precursor will be better than his successor. I can not follow the, since both systems are running well and have the same problems as any other water cannon also. There is simply no 100% accurate water distribution unless in a room with no air movement)
For me - so far - is the 8135er suspend nothing. He works and blows reliably and smoothly, and that's exactly what I expect from such a part, I already have to connect it because of prolonged drought.
highly recommended