It is actually quite low. With a riser you will be fine.
It's more that I don't want my face or mask touching the stock - besides masks being uncomfy that way and tending to move, it interferes with speedball style railroad barrel sighting, which is how I roll and is I think biomechanically the best way to sight for PB (but not for RS). If you can really call it sighting that is.
I think it's a good design practically even so, and ideal for a first stock for the MG100.