We could also discuss the flyweight driver heads played at extra lengths(47"+). They worked, for some/few, but not the majority, but for the most part the ones they worked for eventually have gone back to "normal" drivers. From what I read.
Will I try SL irons......perhaps, if I have the time to tinker. Had thoughts of such things myself years ago as I could hammer a 6i, but nothing longer and few shorter; always wanted a set of clubs at 6i lengths. Many people have had the same thoughts thru the years, no doubt. But 1 or 2 fellas having a modicum of success with them will not make them a mainstay in bags.
If you truly want to help BANG Co. get back on the right track......I'd say pass on this outlay of moolah. Keep on with what you know best.
Now, if I'm wrong a year from now, you can always come and kick my ass! : )