Product review (4 stars): If your board needs replacing this is an easy fix
So far so good... the defrost cycle wasn't working on my GE Bottom Freezer unit.  So far this seems to have fixed.  (tested other things first before buying this to make sure they weren't out - e.g. the heating element or the over-temp sensor).  Note: this board is for quite a number of different units.  As usual I read and re-read the installation instruction prior to installing and because I have a bottom freezer on my unit I needed to do a bit of surgery - that is, snip a couple of wires.  The instructions could have been laid out a bit better, specifically separating out the wire cutting procedures.  Other than that minor annoyance, unit was well packaged and came in a timely manner.