Pros: Device is awesome. Best VOIP phone I had ever had. good technology and I pay only the tax around 4$ per month. I do user their international 1000 minutes for 10$ per month. Easy to setup (minutes) if you are taking a new number. Number porting may be average 5 days and will cost you $30 or $40 if you did not pick $99 / year premium. Number porting is free along with Premier Service. You can use a phone splitter and branch a line to a fax machine. incoming fax might be tricky (not recommended for mission critical fax receipient), out going can be easy as dialing *99 as a prefix.

Cons: I could not find any issue

Overall Review: if you want Call Fwd, receive calls on Mobile and out - you better research