What I was frustrated at was the guy who told you that spring straps were required. He obviously knows almost nothing about DIR and here he was "educating" you about it.
BTW - spring straps are great and I certainly recommend them. I can't think of a downside but I can think of plenty for the rubber straps.
Hunter
Just so you know,
He bought the fins and a full DIR / GUE compliant rig from me. He informed me that he would like to follow a GUE / DIR approach to his dive training, and asked for my input on a rig. I sold him a compliant HOG /DIR rig so that he would have minimal grief when he met his instructor and got ready for his classes.
He then asked me if I could sell him some spring straps. I responded that Although I PREFER spring straps, the ones that I had in stock would not be compliant to his training criteria as they have a big goofy loop on the back and are used mostly by OW divers. I was out of the simple spring straps at the time. I then suggested that he check a local shop, and / or talk to his instructor about straps that would fit his training requirements. Never did I say that the straps were a DIR / GUE requirement.
BTW I do have a pretty good friggin clue of what I'm talking about.
Safe diving