I picked up the ISO-T with a Maltby UL R flex when it was first released. I hated it. BUT, my swing has improved, gotten a bit faster, and now it’s a nice “wind” option for me.
Understand that it’s a low spin head, with slightly more distance from the face to the hosel. I play it more forward in my stance than a more normal driver. Also, IMO, the Maltby driver shafts tend to run firm to flex, and I would classify this R flex as more firm or uniflex than regular.
It’s not for everyone. But, in my opinion, I think it’s a viable, cheaper alternative to the Tour Edge C721. It is not as forgiving as the C721, but otherwise seems to have the same low-spin characteristics and lower flight.
Hi Woody. Since nobody has chimed in, I still have the ISO-T as my 1st alternate to my TC driver and still use it from time to time. I have one of the Diamana S+ 60 S in it (MR0034). In the TC I have the older 55 gram Diamana Blue Board 55 S flex. I had tried the Aldila Rip X in the 65 S in the TC last year and although the ball flight was fine, it definitely felt stiffer. Still could use it, but I prefer the others.
That’s my two cents worth.