Compared to other similar products, the frame has less rigidity. Without the screen attached, it's impossible to move the screen any distance, as it will just fall apart - really relies on the screen tension to hold it together.
When dismantling, it's important to lay the whole assembly on the floor - I had one occasion where someone "helpful" decided to take the screen off the frame while it was resting up against a wall. Not a good idea- once the tension goes, the frame becomes very "floppy", and it would be very easy to break joints/connectors when it's in this state.
The bag for the screen material is a little bit on the tight side - care is needed when folding up to ensure the screen will fit. The lightweight bag for transporting the screen certainly takes up less space than the hard-case solutions offered by other manufacturers, but it offers virtually no protection to the contents, so care needs to be taken that this is not thrown into a van or the back of a car with other heavy items on top of it.
The screen membrane is pretty difficult to stretch onto the frame, though that appears to be a common problem with this type of screen (why not give decent sized stitched-in handles for stretching the screen onto the frame!!)
Quality is in general, fine, and to improve on it, you'd have to pay an awful lot more money! Good value product.