I would love to put some on my Tahoe, hopefully down the road. I have King 3.0 in the front and Fox's piggyback raptor shocks in the back on my f-150. Ride is night and day and my F150 is much smoother than my lifted Tahoe on gravel roads or bumpy terrain. The King coilovers have an adjustment to provide up to 2.5" of lift, Fox ones are 3" I believe. I can go 50 mph down a really bumpy gravel road with potholes and everything and not get as much as a rattle. Before with just a leveling kit, the ride on that road was so bad I thought the dash would fall apart.
I wouldn't say leveling are bad since everyone, including myself, uses them. They do throw off the geometry of the suspension and can result in ride quality degradation. In my experience, going for a suspension or body lift works out better but is obviously more expensive. I haven't dealt with the magnetic suspension much, not sure how the approach would be different.