I also got the same email, telling me my SH3 has better WIFI. Trouble is i dont have an SH3, i have an SH4.
And my WIFI is way better than anything offered from VM, as i am in Modem Mode with my own router.
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Red (VM SH2 AC Beta tester)
Running on 1Gbps VM service with SH4 in Modem Mode, with a ASUS RT-AC5300 router. With this setup I get Fantastic WIRED and WIRELESS Signals in my home. I dont work for VM. But I work in IT, and I know my tech.
My advice is at your own risk. If you are happy with my answers please press Kudo ?