I can't address the operational considerations, because I have never had the tanks. There is a person on this board that has them, but I can't recall who it is. Hopefully he will answer.
Meanwhile, there is another point to consider. If you add tip tanks, the airplane's wing span will increase, and it will no longer fit into a 40' wide hangar. 40' is a very common width for "small" hangars, and the next size up is significantly more expensive. Maybe something to think about for you, maybe something for future buyers to think about that might make the plane harder to sell.
My 2 cents.
Kevin
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