It's roughly halfway between a MG and PG in size. I posted a pic in another comment with HG Gramps next to it for a sense of scale.

Overall, the quality was good. I did notice a couple small gaps between pieces and 1 or 2 mistakes in the manual, but didn't run into any fitting issues. The build experience was good, and also different for me. The kit comes with a prebuilt die cast frame, so most of the building aside form the weapons and backpack is putting armor on the frame. The frame is both a blessing and a curse when it comes to posing. It helps negate the added weight from the backpack, so it won't fall over backwards, but also the hips can have trouble supporting it in some dynamic poses. The stand was included, so it's easy enough to mount it and use whatever pose you want.