Yup, I don't use the Magnetospeed, but friends that do run some variation on this theme.
If you watch the Tubb videos on his new ELR Rifle systems, you will see the rules require that any electronic aides must be weighed as part of the rifle and be attached, so he has something similar to what is in your attachment. By not having the weight and stiffness touch the bbl, the tuning dynamics are much easier to manage.
I went with the LabRadar mostly to be able to watch the downrange data develop. They all have pros and cons, and the Magnetospeed has certainly proven its worth to many.