Dead on arrival M15x

Howdy,

I recently purchased a refurb M15x and it was dead on arrival.  Kept getting hung during software install, asking for a MFGtools password and such.  No way around it.  I called customer support and after 1hr on the phone was told that a 'New' machine was going to be built and sent out to me.   If anyone with replacement experience can give me a timeframe that i may expect the replacement?  

I was ensured that since the unit is completely inoperable my 21 day return would begin with the arrival of the new unit.

Can anyone with experience verify?  I understand that things happen, and i do want the machine so i can wait for a replacement.

thanks.