Neil, what is more important to you: the quality of the product or the name of the product? We cannot compare a car brand (millions of customers/year, many of them buying cars just because an expensive car provides a certain status in the society) with an EDA tool brand (hundreds, maybe thousands of customers, all of them judging a tool by its capabilities/efficiency/costs per license).
Intel did the same rebranding thing with Altera and AMD will probably do the same with Xilinx in the near future. As far as I remember, none of these companies are German based… 🙂

Most people still refer to “Tessent” as LogicVision. It seems that folks in our industry still maintain some respect for these original products and brands…. except for a handful of folks in Germany, blinded by their own Siemens …..brand.

Yes, Mentor was the oldest name in the industry. I used Mentor tools when I started my first job in 1985. On the other hand, after Siemens acquired UltraSoC in July this year people I know there have put “Tessent Silicon Lifecycle Solutions, Mentor, A Siemens Business” as their company affiliation. Maybe that will now become the far more snappy “Tessent Silicon Lifecycle Solutions, Siemens EDA”.