I have it currently set to "failover only" on my Ubiquiti device, as it's snowing sideways and there is a tremendous (read: 30%) amount of packet loss at the moment.
I don't yet know how to do automatic failover due to packet loss on a UBNT device, but that's what I'm looking up this afternoon.
Anyways - I have 3 ISPs, with two of them being LTE. One is the unlimited ATT iPad plan, since I have a router that currently identifies as an iPad (so modern) with the other being TMobile home internet.
Up until this snow storm, I had both of the LTE connections in failover only mode, using Starlink exclusively since about November, when there was an update that stopped the "disconnect all active sessions every ~45 minutes when I lose physical sight of the satellite I was connected to" problem. I guess that was when sat to sat communication came online in my longitude.
I will also note that my IP has been static on Starlink for about 2 weeks now, which is the longest it's ever been. It's still CGNAT, so multiplayer game hosting is mostly out, unless the game handles it. Most don't.
Overall it's a decent thing, but I would recommend at least one backup ISP for those rural or thinking of going rural. LTE Hacks group on Facebook can help you tremendously if you are considering buying a place outside the range of normal wired connections.
It's kind of funny that snow took it down 1 day after I started looking at the premium option, which I'm considering if I can get my workplace to pay $300 per month, with me covering the other $200. Kind of dulls the excitement for that...