I'd imagine that most of us in the stringmaking business are only interested in making the best possible strings for our customers.
I have no plans to switch. 'Course my opinions are a bit different than SBD's when it comes to strings.
I haven't tried the material yet, but I get a lot of feedback from a lot of excellent archers, including a World Champion--folks who shoot a lot better than I ever will, and take their equipment very seriously.
From what I can gather, the main difference is the cost--at least based on the way I make strings.
Old Fast Flight was SK 65Dyneema. Dynaflight '97 is SK 75 Dyneema--a significant improvement. Dynaflight 10 is SK 78 Dyneema--a slightly higher grade, quite a bit more expensive. Worth the difference? Not to me, at least not yet.
450+ is a decent material, and I carry it, but don't get many calls for it.
If you want to try out a small diameter string, I suggest Formula 8125. A smaller strand diameter than Dynaflight '97, but almost as strong (120# test vs. 125# test) and very low stretch/creep. 10 strands will make a very small diameter string, and still be safe for a fairly heavy draw weight--plus have enough strands in it to help avoid a disaster in the field if a few strands were to be cut, abraided, etc.
Until I learn of a significant difference, I don't plan on investing in Dynaflight 10.
Chad