What Brian and Gopi said!
I've used both Mac and iPhone apps since day one on each but I have to admit I used to be terrible at keeping on top of reviews until I got the iPad version. Now it's so easy to do my review I've already seen a huge improvement in my ability to work my system.
I have a little weekend ritual to go unwind in the coffee shop in my local Waterstones (large book store) on a Sunday afternoon. I'll get myself a large mug of coffee and a cake and go chill on the sofa with my iPad to do my weekly review and plan my '
big rocks' for the week.