(edited for clarity and added picture)
I think you'll be happy with it.
My only complaints are the instructions are terrible and I really wish it was 54" deep.
I added the wall foam thinking it would be good for protecting the liner and to help hold heat a bit. I'm not sure how much it'll help either because it's pretty thin.
The gap between the bottom tracks need to be larger than the instructions show. They showed a 1/2 inch gap but it really needed to be 3/4 to 1 inch. Just make sure your Radius measurement goes to the center of the track for the wall to start and stop points to line up perfectly. Instructions weren't clear on that at all. (see picture)
Also the plastic liner strips won't fit over where the walls overlap. I had to notch the strip. And then I added a few pieces of duct tape to protect the liner from the metal top track. Maybe I'm missing something but it all seemed pretty risky to tear the liner. Seems like there could be a better way.
I only went with the foam floor because of roots. I figure between the sand, felt guard, and 1" foam it should be protected well. Also the sand I got ended up having a lot of junk in it like mulch because it was piled up next to a mulch pile where I got it from.
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Thank you very much.
I noticed that you are running a 1.5hp pump and 19" filter. I was thinking 1hp pump and 21" sand or a 150ft cartridge filter?