Folks, Help me please.

1. Is new Q7 2011 premium-plus (51K+ttl) worth it? vs Acura MDX Tech-pkg (44K+ttl) - ie a 7K difference?

- Note Acura has higher HP 300 hp vs Q7 272 HP

2. Is it true I have to spend 3K every 10-15K miles to change tires/break-pads/sensors for Q7 and not for MDX/BMW-X5?

- I spoke to 4 audi service folks and they said "it depends on your drive" pattern...not sure what does it mean?

- Couple Audi salesmen said -- yep, Acura tires will last 30-40K miles but Audi wont for the same driver/pattern - what??

3. Can you share your "horror" story of dealing with Audi dealership to address your audi issues under warrenty?

4. Why Audi is known for its realibility issues vs BMW/Acura?

Saving my all pennies to buy my dream car - Q7 yet, worried about realibility issues - so veterans - please HELP me, please..