I have been using Simplepay for about 18 months now, two seperate businesses, one with 7employees, the other with 15 employees. With regard to their back up, i must say they will suprise a lot of people, as im not their biggest client by far they still go out of their way to attend to a query very quick and efficiently.
I have used the exporting into easy file employer and must add thats its a life saver and extremely easy.
Will not change anytime soon.