I bought 3 new GM cars in the past decade and bought 100K warranties on all of them. The first was my 95 SSEi and I only used the extended for the traction control module thing in the console that cost $300. I lost money that time.
The second was a 97 Tahoe. At 74K a new air conditioner compressor, then at 77K a new short block! Bad main bearing was knockin' like a SOB. I made money that time.
My next 04 Tahoe has 75K on it now. Absolutely no problems. If something doesn't crap out in the next 25K miles then I lost money on it'* warranty also.
Now I have an 05 GXP with 13K on it. I didn't buy it new so it just has the original factory warranty but I can still buy the extended just like you. I don't really know if I'm going to or not. It'* much easier to finance it with the car than to plop down the cash all at once. I'm curious as what everyone thinks. I didn't help you did I?