I think boards can really help the RAW lifter but there are some things to keep in mind. Here's what I have learnt this year:
1. Do not neglect the bottom end and just press heavy off boards. I did no full ROM for almost three months and when I tested my max expecting a big increase, my technique and balance/bar control at the bottom was so weak I barely pressed a 2.5kgs PB despite pressing 15kgs or so more off a two board.
2. Boards work well for tricep and lockout work. Things like close grip pressing off 3 boards or working up in a tricep hell fashion.
3. Just because you can press it off a 2 or a 3 board, does not mean you can press it off your chest. Boards don't work for raw lifters like they do for a shirted one.
4. Use boards to work your sticking point. It's a humbling experience but it will really help your full ROM.
I'm sure there's more but that's all I can think of right now.