I would have the local pro shop heat them up for you and get them molded. The biggest difference I could feel was the decreased motion from side to side (I have a narrow foot).
I've also been contemplating whether or not the foot injury that I recently suffered was due to NOT having on a heat molded binding. I switched from the Ronix Relik (heat molded) to the women's version (Faith, Hope, Love - not heat molded) due to a warranty issue and not being able to get the replacement Reliks timely. I guess I'll never know, but I just don't think my original Reliks would have allowed that type of foot flexion that was the root cause of the injury.
(Well, in reality, rider error was the root cause for landing a tantrum on top of the 2nd wake vs the downside!)