The Router Raizer looks like a very well thought out bit of kit, and looking at the high res pictures of it on their website installed on routers, I'd say it's reasonably priced given the machining involved.
Without knowing about the Raizer, I had long ago made a somewhat cruder version of it for my M12V on my router table. It consists of replacing the standard (short) M8 threaded bar with a longer length of M8 studding, a length of tube over the studding to bear onto the lug of the router body, and an M8 handwheel, (plus a washer either end of the tube to take the thrust). The handwheel then clears the motor housing for easy access. Maybe a tenner or less for the bits if you have to buy them (I scrounged some odds and ends for nothing). No machining required, just a hacksaw and a file, and no permanent mod to the router.
No, you can't adjust the router from above the table but access is real easy from below. It's crude but effective. Although the Raizer allows for normal plunge action, if your router is dedicated to the table as mine is, then it's hardly a useful feature.
If I knew how to, I could post a picture of my setup for anyone with, or considering buying an M12V, who may be interested.
Ike