Even if they've never given you shoulder problems, they're not the best unless you have to use them in a competitive setting. CrossFit uses overhead swings so that each rep can be counted.

But if you're not a competitor who needs to use the overhead version, your posterior chain will get more out of the exercise by just using a heavier kettlebell and doing standard Russian swing.

Related:  Question of Strength 53

Related:  Kettlebell Swings – You're Doing Them Wrong