Question Re: GM Major Guard Protection Plan transfer

[H3SOCAL]

I've been getting these vmails and mailings about the GMPP.
I have an H3 '06 which has the 4/50,000 warranty

Is this a warranty that goes along side of the warranty i got when i purchased my H3?

I have 30K on my H3 right now.

Just confused about if this is an extended warranty or if GMPP is another protection plan they are just trying t sell me.

Has anyone bought this GMPP 36/45K ???
Is it needed or not?

thanks