So i bought the 25-in-1 to test, with ability to exchange it for the dual if it didnt work out.
Via a USB3 port i got 79.6 MB/s read / 78.3 MB/s write in CrystalDiskMark benchmark. This was with a 64GB Sandisk Extreme Pro UHS-1 SDXC Card rated at 95 MB/s.
In a USB2 port the same card and reader topped out at 38.6 MB/s read / 38.2 MB/s write so the USB 3 did add something.
Which is funny as i got a reply today from Lexar Support stating that it while it would read and write UDMA7 and UHS-1 cards, it wouldnt give the expected performance.
Thankfully they were wrong.
Perhaps the lexar pro would do bettter but 80 MB/s is close to the cards rated 95 MB/s and condering normal USB overhead close to its max real-world performance anyway.