Sling style seat / comfort = Millenium Stands.
Never used one of their ladder stands but coming from a Summit fanatic, the Millenium lock on style stands are the most comfortable I have ever sat in.
Ive hunted from millenium ladder stands and they are very comfortable. Get the foot rest and its like being in your favorite recliner. The shooting rail is adjustable which is great.
If it ain't broke, don't fix it.