AS you can see I loved the 650 so sold my 600 and got the 650. The difference in contrast between the 2 is amazing. I think when you see them side by side you will get a better idea especially when you see how small they both are.
I would ask them to get 1 of each out so that you can hold in your hand so that you can see what is more comfortable for you.
But good luck whatever your choice one thing for sure you will enjoy using it
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