It took me a long time to fully commit and buy this. But I am glad that I did. I'm about 6ft tall and while I have to bend/tuck my knees this is still perfectly good to do pull ups and dips on. I keep the base fully assembled and just take apart the vertical bits for easier storage.
I like the sturdiness of the whole thing and it feels good in your hand.
Only downside really is that to provide a solid base it does take up some space - but since you can pack it away it is less of a problem.
I bought a graded version which was mostly fine, a bit of rust as expected. Two of the rubber feet were broken though but on asking customer service this was very quickly resolved.
So if you're sitting on the fence, get one!