Does anyone use OOMA?

is it good or not?  your input would be greatly appreciated.

http://www.costco.com/Browse/Product.aspx?Prodid=11675338&search=ooma&topnav=&Mo=0&cm_re=1_en-_-Top_Left_Nav-_-Top_search&lang=en-US&Nr=P_CatalogName:BC&N=5000043&whse=BC&Dx=mode%20matchallpartial&Ntk=Text_Search&Dr=P_CatalogName:BC&Ne=4000000&D=ooma&Ntt=ooma&No=0&Nty=1&Ntx=mode%20matchallpartial#BVRRWidgetID