To my way of thinking, the G 30 IS a G 19 sized gun. It is only slightly smaller in length and height, and a little thicker to accomodate the .45 ACP in a double stack mag., like the 19 has. The G 30 can also use G 21 13 rd mags.
I had my G 30 to the range today and thoroughly enjoyed putting another 150 rds through it of WWB 230 FMJ, and 185 JHP +P Gold Dots. It grouped great at combat distances of 20 - 25 feet. It is a soft shooter compared to other .45 ACP I've fired. I think it is a great compromise as a CCW firearm and will be my primary CCW when my Crossbreed IWB holster arrives. I do not think is is a great bullseye target pistol, but it is the best for me at what it was designed for. Try one and you'll be hooked.