Be aware though that Ariben naturally use the FAA definition of P1 time, which with an instructor in the RHS would have to be P/ut in your JAA logbook. They also count safety pilot time in their quotes, which can't be logged at all under JAA rules. Still worth a look, but you may have to halve the time you'll get from that quoted.
Not sure that the above is strictly correct. If you are receiving training from an instructor then you would log p/ut. If you were the sole manipulator of the controls then you would log P1 (irrespective of whether an instructor came along for a jolly in the RHS to cream some of your hours under FAA). If you were sitting in the RHS acting as safety pilot for another hour builder under the hood then under JAA you log nothing. Hence why you need to halve the hours on the Ariben packages and see if the rates are competitive.