If I'm honest very, very little. The r7 425 and the r7 superquad are virtually the same driver. The superquad has a black head where the r7 425 is just metallic.
If you mean the rule prevented a driver from having a C.O.R of more than 0.83, then yes, it is legal to use. But of course, you can't adjust the weights during a round.
Hard to say, try eBay or trade it in, there are no set prices for used golf clubs, just suggested values.
Neutral, with the two heavy weights at the front and the two lighter weights at the back.
You will need to use the Taylormade wrench that you got with the driver. You simply unscrew them and put them in the configuration that you want. For a draw, put the two heaviest weights on the heel side. For a fade, put the two heaviest weights on the toe side. For a low flight, put the two heaviest weights at the front of the club. For a high flight, put the two heaviest weights at the back of the club. All these are for the strongest option, if you want the weaker ones, use one heavy weight and one of the light weights. If you don't have the wrench you will need to buy one, it is the same as was used for the old r7 and any other Taylormade club which had the moveable weight technology. Do not use a standard tool because it will ruin the weights.
The weights are used as follows for a high shot you put the heaviest weights at the back. For a low shot, you put the heaviest weights are the front. For a draw you put the heavy weights on the heel side. For a fade you put the heavy weights on the toe side.
It depends on what you need. If you are not that consistent, I would go with a driver with movable weights like the Taylormade Superquad. If you are pretty consistent, I would go with the Nike Sasquatch Sumo2 5900.
Neither is really "high maintenance" but if I had to choose one, I would say free weights because you have to take the weight off and on to adjust, as opposed to machine weights, all you need to do is adjust the pin to get a heavier weight.
You are honestly better working on your swing, practicing your timing and squaring the club face through the impact zone. The r7 drivers with movable weight technology are aimed at a player who wants to be able to work the ball. If you slice the ball all the time, set the weights to draw, this is done by placing the two heaviest weights on the heel side. If you only occasionally slice the ball you may find when you do put a good swing on it you will hit a big snap hook, which was no fault of your own.
There is no set way to adjust the weights in the new drivers. Each person and swing is different. You need to go to the range and start with no weights at all and tune the club to your swing. If your pushing or slicing the ball start by placing weights in the toe, and work from there. It's all trial and error to find what works best for you.
Weights which have been carefully measured and crafted for the specific purpose of calibrating scales should be used in scale calibration. These weights need to be of a known weight in order to adjust the scale.
Yellow weights in the middle and red ones on the outside sets it to nutural