I have found the pluckable foam durable and simple to use, but not the best thing for equipment that comes in and out of the case frequently. The foam cubes start to come off where the gear moves in and out. It is also somewhat expensive to buy the inserts (my experience has been with Pelican cases). When I re-foam a case I prefer to buy the closed cell foam from a foam store and cut to fit my equipment using the layering technique. The store should be able to sell you glue for putting the layers together too. Here's the trick on cutting the stuff, use an electric carving knife, like you'd use on a turkey. I got mine at Target for about $20. The guy at the foam store showed me the specialty cutter they used, and it's just like the carving knife except for the supports to keep it square.
I have used this technique with a few Zero Halliburton cases I hunted up on fleabay. Using the undulating foam I have a few that will hold gear firmly without custom inserts which is handy for specialty kits to be taken into the field.