Hi LarryH,
Hopefully countinsheep and boo will see your post and share their comments but I would guess that the biggest single reason would probably be the significantly lower price for a very similar mattress.
There is more about how Savvy Rest compares to SleepEz in post #4 here and a forum search on Savvy Rest SleepEZ (you can just click the link) will bring up all the forum posts that mention both of them as well.
Phoenix