Hi, FB family

I am considering to buy an ankle weights, but I am not sure, if I should.

I love strength training and use powerblocks regularly, but I like pilates too.

Is there significant difference between exercise, for example reverse leg lifts, with and without those ankle weights? If yes, what weight should I buy? (there are range of 1-10 lbs)

I just want to know, if it is a good investment. They are not expensive, but still...

Thank you