Yes, the've been catering to the "Pro" market for years - work boats and sail. They've only been out to the outboard market for a few years but are good value for money - cheaper than Seastar in France.
We used it on our P20 in OCR but it was almost impossible to get all the air out, hence we constantly had play. Nick Barsch managed to side mount his and successfully got the air out. Certainly would not recommend it for racing or for engines above 150HP. It is like Tony said, you get what you pay for.
I personally dont like any steering system that relies on the single bolt at the pivot point of the engine after having one shear whilst flat out!
They have a range of side & center steering & go up to 300hp for outboards. I don't think Seastar does has that offer. But I wouldn't use it for race though.
ER...... Side rams connect via a single bolt as well.
You could even classify the tilt tube mount as a single bolt also.
At some point there has to be a single bolt or it wont pivot
As long as you keep an eye on the bolt and change it regularly it should be fine. They generally shear because they come loose and are then subjected to shock loading. As I said before, just keep checking it and replace once a year. If it worries you that much then get a uprated one from ARP or such like.