@Aortner is selling that in Austria. Seems to work well and people like it because it’s a plug-and-play robust box. Technically I can’t see any advantage over Ardusimple + @MTZ8302 's dual RTK solution. With the Ardusimple, you can start with a single (+CMPS14 as option) and upgrade any time if needed.
So finally it’s up to you, if you want to spend the money to a European crowdfunding project + open source software maintained in this community or spend even more money (the offer I got was $399 for the C1-FD module) to a Chinease company.
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