Okay so I have Alexa and just tested it out
Once you set it up the ghost speaks to you in the same voice it has in game, you can equip different loadouts and have it save to either crucible, raid, strike, or nightfall, then ask it to switch to the corresponding loadout
It also tells you what your next milestones are and stuff but that's kinda whatever
The ghost is personable though like all his voicelines are pre programmed it's not in a choppy tone like how Alexa speaks
It's fun if you have one but it's not worth getting an echo if you had no reason to have one originally
(That being said catch me buying that ghost Alexa asap)