I owned a Stimvac which was similar to the Scorpion in appearance, gave a couple of Rainbow guys a source of amusement and they made some sarcastic comments when my operator was setting up.
Strangely, their client called me for their next job, having compared the results.
No matter what it looks like, or how powerful, or what it cost, the person at working end of the hose is more important.
Often wish I'd kept it as a back up for the Ninja
robbie