The pump is not changed.
The body is, I also asked Vertex directly about this. that was the reason why I bought the SRO, which for me was a mistake.
I would still say Vertex is way better value & service.
If you want value Vertex, if you want to spend more money , spend a bit more & get a good skimmer.
There are many options out there ATB, alpha cone, I-tech.......
no need to spend more than 600 on a skimmer that comes out of the same factory as Vertex.just my 2 cent.
Yes they also confirmed that Honya OEMs the IN line for them.
I personally think BB was a good attempt at copying askol but they cheaped out on the components.
difference in price between the Ti screws that bubble king uses and stainless steel from Honya is probably cents, but it does add up & that is how asain manufacturers make products cheaper.
Does not matter how good the pump, the rust issue is unacceptable.it is simply cutting corners knowing this will happen, I wouldnot buy from a manufacturer with this type of mentality. The rusty screw you can see in a month, if they designed & made the rest of the pump the same way cheaping out on every component, I don't want to know what will break inside in 6 months.
However as many stated it is free market and you never know until you try

Hopefully they are listening to us & changing things for better, but I am not going to be their beta tester again.
another point people tend to defend the product they are using, we are all passionate about our hobby & how wemanage our tanks & tend to act that way.
personally I think the difference between them so little not worth arguing over.
see what is your budget & buy what you are comfortable to spend.
What is for sure is that the more you spend the better product you get.
but inthis case to pay double for SRO over vertex is not justified since you are getting the same thing touched & made by the same hands.