Product can be improved, but that doesn't mean it had any shortcomings compared to its description.
Some suggestions for improvement in the product (power cage with pulley) are:
a) The bolt should be the 'coach' type so that the user doesn't have to use two spanners to tighten it.
b) Should supply something to tighten the bolts with - some spanners or something - it comes with nothing to help in that regard; luckily I had the needed spanners
c) The product can do with one extra metal strip sitting horizontally between the rear poles about half-way down vertically for additional strength.
d) supply all nuts/bolts in 70mm length since it is a pain to remove the refit the bolts if you happened to fit the shorter ones where 70mm ones should've gone. They all come in a single package and the different lengths are not readily discernible (unless you remove nuts from bolts)
e) Two front legs/poles had an extra hole and initially I couldn't understand what these were for (they cannot be used, as you can understand when you put the whole apparatus together)