A support review can be very challenging if you choose the more traditional legal route for your separation or divorce. You can only request a review of support if you prove a material change in circumstances. The financial or circumstantial change has to be one that could not have been foreseen while you were settling your divorce. These requirements could lead to a support amount amendment being extremely challenging and require lengthy court sessions.
The advantage to mediation is, at the time of creating your memorandum of understanding, you can include a date to review support allocations. I have found that separating couples are more likely to come to financial agreements about support when they know there is a predetermined timetable for making changes.