I often switch back and forth between Firestorm and LL Viewer when helping customers with issues. I have found ways to be comfortable with either viewer BUT the limitation on LL viewer to not be able to derender a neighbor's way too low sky platform, a surround box that blocks my view of the water, or a random chair hanging in mid-air is very limiting. It seems a small thing but can make a huge difference when wanting to be comfortable on one's own mainland plot.