Replacing spokes on those wheels is not fun since it may take some time for the shop to get them. Shimano doesn't always have spare spokes in stock. If you have a fallback wheelset then it doesn't really matter since you can ride it until the other wheel can be repaired. If you do end up getting another wheelset I would recommend getting one with spokes that can be replaced easily. Not all factory wheels use proprietary spokes, and some straight-pull spokes can also be easily found.