Drop Down Tanks?

[kitti-fish]

I’ve been eyeing one secondhand for awhile but have heard issues with corners eventually failing, debris building up, and just issues cleaning. It’s a really cool tank and I have somewhat an idea for it (would be a very very slow build and lots of research) but I’m unsure if the purchase would be worth it even if I haggled down. Can anyone give me insights if they own one, had owned one, or serviced one? Tank in question is IM Concept Glass Abyss Panorama 20g AIO Aquarium. Seller says he’s second owner so dating tank 8 or 9 years old. Waiting for more pictures atm.

 

[Tahoe61]

I love those tanks.
Not a lot can go wrong on a 20 as they are so easy to clean.
If it's priced as an older tank and it holds water I would jump on it.