I bought the snoogle thinking it would be a fantastic thing! i stopped using it about 3 days after I got it.
It's HUGE in bed, and we too have a king! It takes up so much space, and requires me to fully wake up to reposition since it involves taking off covers, flopping th huge thing around, and then re-covering. Dh is none too happy about it. not to mention, it's like the size of another person in bed.
NOW I think that it might be good, now that I am needing more support for my belly and back, and using 2 extra king pillows is just as cumbersome if not more so, since they're not attached. the squishy king pillow between knees/under belly is working OK fornow, but my back is getting jealous of the support.
I too used to be a tummy sleeper, and this adjustment is not going so well... i toss and turn all.night.long.
so, my point- maybe the snoogle isnt so bad once you get further along. in the beginning, it was just too much for me.