Keep in mind that you are seeing a carbine conversion unit on a pistol, not a purpose built carbine. If you're looking for a SHTF pistol caliber carbine that shares your Glock's magazines this is an option.
I've not seen one but I've heard that they are heavy. They are also not cheap. List price is $339 w/o any sights. Iron sights go for an extra $69.
All things considered I'll pass on it. Not because it's ugly, but because overpriced.