Any furniture that's been sitting on a showroom floor for a while will have had many people sitting on it, staff and customers, resulting in a lived in feel in quite a short time. You may order something else that feels perfect in the store but you may end up with the same issue.

I’m with @spiritflower. Our new leather sofa & chair purchase some years ago felt the same way you describe. These pieces are well made frame & springs, high end & will outlive us so could be ”heritage” pieces. Sales person also cautioned us that our new pieces would not have the old glove feel of the show room pieces. Fast forward 10+ years & they still look new, chair is very broken in & comfy & couch almost as comfy. Note that we aren’t large sized folks, not hard on furniture & no kids sitting or flopping on it. I realize describing my experience doesn’t answer your question but it might give some insight to future for your pieces.

This sofa looks very deep front to back. I think the sliding off sensation is because it is so deep and it's leather, which is slippery. I bought three new sofas last year and noticed that a lot of sofas are too deep for my taste. I made sure to get ones that measured the same front to back as my old ones which I liked. People may have different preferences and it also depends on whether people will usually be using it sitting upright or reclining. So if you decide to return that one and get another, keep this in mind.

I also prefer to get a sofa with three equally sized seat cushions so that they can be flipped and moved from end to end regularly which reduces wear. And finally, as the previous poster mentioned, all sofas will get softer over time.

It would softer by the time. :-))

Another note cushions on my 2 cushion sofa cannot be rotated. They are shaped to fit specific space & have zippers & hooks along back -both seat & 2 back cushions - that hold cushions in place so they don’t slip out of place. I love this as I hate messy cushions but it does make for structured pieces.

It's true that the sofa feel will change over time.

I had a client that had an issue with sliding off new seating, but we soon determined that they were wearing polyester, and somehow that contributed to the problem. Natural fibers in clothing did not react in the same way.

We ordered a leather sofa from a small NC firm and it was butter from day one - not sure how I would feel hoping my sofa got more comfortable

(leather comes in a huge spectrum - full grain aniline leathers from Italy are supple and matte, not slippery)

"I also prefer to get a sofa with three equally sized seat cushions so that they can be flipped and moved from end to end regularly which reduces wear."

I agree with this. We had a sofa made from Basett several years ago. I really like being able to rotate the backs and seats. Still looks new.

Thanks everyone - you're all making me feel a bit better. Do you think the cushions would soften AND acquire that "springy" feel (it's hard to describe - it's like, soft, yet supportive)? Or would they just get softer?

Another question - looking at past threads, it seems like a lot of people really take issue with PB quality. Are their sofas truly as junky as many comments would make it seem? Or is it the kind of thing where, if you have a positive experience, you're not necessarily writing about it?

A bench seat on a sofa is a luxury and an upgrade, especially in leather. Nothing worse than sitting on the crack when there are three cushions.