Both of these are very cheaply made Nintendo Famicom clones, both feature Famicom cart slots, but the power joy ended up having rom's included inside the controller itself. Both units were extreamly beaten, broken and nearly unplayable .. there is only so much you can do with rubber bands and duct tape in a situation like this, so I decided to make my own TV plug in play system housed inside a much better controller, the NES Advantage.
Step 1: Washing of the Advantage
Sluggish joystick, and buttons that would get stuck if you did not hit them dead center, + it was very dirty even though the seller said "clean". Taking it apart for cleaning would be needed and I attempted to fix these issues by replacing the 20 something year old rubber domes with tactile switches.
The results to me are mixed, its much snappier, especially in the joystick. but the buttons dont play like a video game button, but like a tactile switch. It doesn't take but a little click of the finger to activate them, but if you thunk down on them like you would an arcade button its like hitting a rock.
Cleaning the advantage was pretty easy, just pop it apart, and anything that is not metal or electronic gets tossed in a sink of warm soapy water, then given a light scrub down. Everything else is q-tipped with cleaner and alcohol