Was the reason for the clamp change a deficiency in the Giottos clamp or something about the RRS QR clamp?
If I recall the exact scenario ... I got the ballhead first, then got the RRS L-plate as the supplied plate is useless.
I think to use the existing Giotto clamp, I was gonna have to take the safety stop off and I didn't like the knob concept without the stop, so I got the RRS QR clamp. I dig the QR clamp, but sometimes it gets in the way of my cable release in certain orientations.
I was able to re-use the Giotto clamp and plate for a flash stand.