The biggest issue I had was with these big kitchen storage units, two were cabinets with bookcases on top, and two cabinets with no bookcases on top. They look great but the drawers were a pain in the ass to get together. There was definitely some user error going on too, lol. But in the end it looks great.
I also got a shoe cabinet and a couch from them, the couch they put together (it was literally just snap the back in) and I put together the shoe cabinet and it was easy (and would have taken less time if I hadn't been drinking wine while doing it, lol).
If you like putting things together it's easy, if you don't it can be worth paying them. I know I bought nightstands that were already put together because I was tired of drawers by that point. I also will never ever EVER buy a grill that's not put together again because holy crap I thought I was going to lose my mind putting that thing together (bought that at Amazon though).
I bought some folding chairs from Wayfair that I didn't need to put together and that look great - they're in the basement around the craft table and can be brought upstairs when we put the leaf in the table for big meals.