Re: Value of spin speeds
The bulk of water is removed by spinning at 830 rpm, after that the quantity left to remove reduces marginally the faster you go.
The fastest spin is usually only touched on for a minute or two at the very end of the spin programme once you move into the 1100 rpm and above machines.
All a bit of a marketing tool IMO, if you are tumble drying then a faster spin might seem better but the efficiency difference of tumble driers negates this.
All AAA rated appliances will give you good results if you use it correctly, dose it correctly with detergent and the difference between 1200 and 1400 is not really a factor, IMO.
Hope that helps
Kevin