Frank, you can get the same electric gizmo for the spolar and the spolar can load close to 600 WITHOUT the electric motor. You will be money ahead with the other units but you will be free from the clatter and bang of the cheaper units, particularly the MEC, it is just not in the ball park. I have owned all 3 brands and they will all make a decent shell. All three are adjustable for different loads but most people if they are loading for skeet, want to get them adjusted right and leave it be. If you buy a spolar they will set up each gauge for the shell and load of your choice. You can, of course adjust it to something else, it is not difficult. The spolar has a vibratory motor that settles the shot and powder drop tubes and I have never had any shot hang up in them. I can not say the same for MEC or PW. The primer tray on the Spolar will hold 300 and the best you can do on the others is 200. It is just a far better built machine.
You asked about the spolar vs the PW, I would recommend the Spolar in a heart beat, particularly since you are sharing the cost. The 410 loads like a dream on it with no shot flying all over the place, try and find someone with a 9000 that says that with a straight face.