According to the specs listed on this Phone Scoop web site, the speaker phone is the old technology of only half-duplex. If this is accurate, the phone is virtually useless. You cannot carry on a conversation when you and the person on the other end are continually getting pieces of your conversation chopped off. The G'zOne Ravine is full-duplex. Is the G'zOne Commando a step backwards?
Full-duplex is, of course, better. However, speaking from experience trying a lot of speakerphones, I can tell you that a good half-duplex speakerphone an be almost as good as full-duplex, depending on the noise environment (and/or noise suppression technology.)
A bad half-duplex speakerphone is an awful thing, but there are good ones that might surprise you. Sometimes we have trouble determining which kind it is; you really can't tell in normal conversation; only special tests will tell you for certain.
I would like to get the Commando. But the half-duplex speaker phone problem is still nagging at me. I have a cell phone with a half-duplex speaker phone (the Samsung Convoy) which I really liked except for the speaker phone problem, which is why it is now sitting in the closet; it also did not have good enough resolution (not enough pixels). The phone I use now is the LG Clout, which has a full-duplex speaker phone and good resolution and works great, but it does not have the capabilities of a smart (or semi-smart) phone. I am still considering the Commando and will check it out at the VZW store; I may take a chance on it; it looks like the best of the lot, and I need a phone that can take a licking and keep on ticking.
I tried out the G'zOne Commando at my local VZW retail store. Using the Commando to make phone calls just does not work. When using the speaker phone, I was continually having parts of my conversation, and the conversation at the other end of the call, chopped off. No one should ever buy another cell phone with a half-duplex speaker phone. If everyone did this, the companies would not make them anymore. Good riddance to those worthless pieces of junk. A phone is primarily just that, a phone. If the calling quality is not good, then the phone is no good, either.