Little Dentist ... wow, you moved fast in getting your new machine! Nice!
I'm with you that not seeing those pokies is important, with the underside looking as good as the top.
The concept being, that the two threads meet right in the middle ... thus no pokies!
Sometimes running your fingernail over the pokies, (kind of like scratching the fabric),
can help bury them.
What I am surprised is that your dealer set up your machine in your home,
yet they did not check that it was stitching properly???
That does not bode well (in my mind).
To me, should have been part of the set up ...
... and they should make good on that with a return trip to ensure it is good from the get-go.