Logitech G15 vs G510 keyboards, anyone used both ?

[Grooveriding]

Hiya,

My G15 v2's screen died on me and Logitech agreed to give me an RMA. They are replacing it with a G510.

I'm really fussy about my keyboard and how it feels in use, my left hand is already horribly cramping if I try to game using the MS Digital Media Pro KB I am using in the interim.

Has anyone used both of these ? If so, do they feel the same ergonomically ?

Thanks