For me, I'd be all over the 45c if it had the grip of the HK 45 full size. The grip on the 45c was the deal breaker for me.
I really liked it when I handled it in the gun shop. When I fired it at the range, it was a no go. Great gun, accurate, and very controllable but I just can't grip it in live fire like I can other HK's.
What a shame since I really like that gun and was going to purchase one. I agree on the P30. A fantastic grip on a fantastic gun!