Yes, there are rumours that the RDS80 is variation on the ZD937, I think. That is a bit of a let down if you spend the money to get a brand name iron. One would hope they have at least rigorous QC in place for the Ersa station.
I don't see the tip selection as a problem, all the 832 and 842 series tips can be used.
Here in Germany the RDS80 is one of the cheapest brand name stations on the market. It retails at about 160,00 EUR. The Hakko FX888 for example is not officially available at all, you can find it on ebay for 270,00 EUR, though. Personally I wouldn't spend that kind of money for a Hakko station. Hakko is virtually unknown here anyway, they don't seem to have an official distributor.
I certainly hadn't heard of them until I found Dave's blog.