Stick it out. Don't cancel. You're going to be blown away going from a Tahoe to an X5. I had my '08 for two years without any major issues, I had a check engine light once which turned out to be a temperature sensor. I've had three X5s and I'm now in an X6. I've had minor annoyances, but never serious issues. The E70 was the most trouble free of all of them.

Good luck.

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Current:
2016 X6 ///M Black Sapphire Metallic