Hi Liz,
You can read a few generic comments about Greensleep in post #8 here and post #6 here and some comments from one of the members here that purchased the Dolcezza in post #5 here and some comments about the Dolcezza here as well.
A forum search on Greensleep (you can just click this) will also bring up more posts that may be helpful although you will need to scan past the ones that only mention them in passing.
Phoenix