I've only seen the Pilot installed on larger yachts over 40ft. Not large enough to fit a full-size sat dome but large enough to know the owners have money
Iridium Go: $1000
Data: $130/month unlimited
M802 + AT140 + Pactor4: $5000
Data: $20/mo or $250/year, through Sailmail
I can honestly say that sat phone
are very dissimilar. The only thing they have remotely in common is that both allow you to send and receive data. I've used the Iridium Go on our transat crossing. I could call my mother 3000 miles away but not the boat in our rally 50 miles north of us. They only had SSB.
What you really want is a Go.