Pprice01, we assume that the smaller magnets were used to reduce cost. Just about all tanks 4' or shorter have glass that is 1/2" thick or less, so the stock magnets will work fine for the large majority of users.
BeanMachine, we will be giving these a test ourselves on 1/2" glass when they arrive later this month. An upgraded magnet should not be needed for 1/2" glass. There are a couple of options to make the pump more secure:
1. You can use the Gyre Pump Magnet Grip Pads. They are available on CoralVue's website for $6.00.
2. You can use the Vortech trick. Use a cord mounting tab (these can be found in most hardware stores) to hold the weight of the pump. Then use the magnet for positioning. It's also a great safety measure for those rare occasions where the magnet get knocked off accidentally.
xmas_one, from what we are being told, the XF130 will be the smallest model made. The two single-sided pump in the images is simply a pump with one of the paddles removed and a cap installed. The cap is currently under development and will be made available at a later date.