Even for international flights over an ocean, I do not redeem to business class or first class. Inflating the value of miles due to F/C redemption is a pet peeve. F/C does not make a $1k flight into a $4k or $10k flight. It's still a $1k flight to me. I do not give any extra value for C/F seats. Even for extra bags, it is not the best use of miles. However, I allowed an exception to this rule with a 7 segment international trip with tons of long flights that total to 23k miles even though it's still not the best use of miles.