OER has been happy to have a great relationship with Watertribe, providing rental PLBs for events.
We've now added the Delorme InReach SE Satellite Messenger to our rental offerings. It's basically a super-Spot > - - satellite based (Irridium - which is better than GlobalStar), 2 way texting, tracking, SOS button, active pinging, send preset and customer messages via email/sms with GPS coordinates and link to interactive map.
We've had some time to play with it, and its a really great product.