If we were talking about an M3 or 911 or or or then I would agree on two sets. The gains are SO marginal for the 5900 # SAV's that it only comes down to appearance in MHO. Nokian WR G2 tires are amazing all year. They are a winter tire and wear well and perform well in summer and rain. I was of they same mind set as you until recently. 99% of us spend 99% of the time driving our vehicles in a straight line from point a to point b. the marginal gains from the dedicated performance set up are not worth the cost or hassle. I look forward to the day that I no longer have all the wheels I have in my basement. Selling some LS460 19" rims on ebay now and then need to sell the X5 18" rim/tire combination too. And like you said no right or wrong and I will add just our crazy MOD reasons.