Here's my in depth review of Diadem Solstice Black 17G.
Diadem Solstice Black 17G strung @ 49lbs in a Prince Phantom Pro 100X 305G with 2G of lead at 12.
USTA rated 4.5
Strung @ 49 lbs on 8/19/20
Relatively easy to string, little to none recoil memory. Strings can easily be notched when pulling the crosses so I "fanned" the crosses when I was weaving them.
String Characteristics
The Diadem Solstice Black has a "Shiny" outer coating which is susceptible to notching even when stringing, compared to regular Diadem Solstice Power Teal which has more of "Matte" outer coating. Black has more of a "plasticky" feel to it when in hand.The "star/gear" shape is also just as pronounced as the teal version.
First day of hitting 8/20/20-2 hours break in
Right away I have noticed that the strings play a bit "softer" than Teal and has more stringbed dwell time on the groundstrokes. Solstice Black is advertised as being softer due to the Black pigment however I believe that "plasticky" feel I mentioned also has something to do with it being softer. Spin production results were about the same as the teal version, Serves and volleys were also about the same.
What I am most curious about is the description that this Black version has better tension maintenance than its predecessor. One thing that prevented me from switching to Teal permanently as my go-to string was that over time, teal became more powerful and more uncontrollable. I managed to somewhat control that with a hybrid setup of teal in the mains and a medium-high stiffness string in the cross (Tourna BHS7T, Luxilon Savage) but even strung at low tensions this setup wasn't ideal, comfort-wise, for me because I also have golfer's elbow. Will continue with my review in my next hitting sessions.
Second day of hitting 8/24/20-2 hours
Once the strings have settled in an and had their initial drop in tension, I could feel an increase in "dwell" time on the stringbed. Solstice Black definitely feels softer than its predecessor. The edges are still defined however, even with the full poly setup there is some string movement now. My hitting partner commented at the end of the session that there is a significant amount more spin and pace coming from my shots than my previous setup of Grapplesnake Tour Sniper Mains and Ghostwire crosses. I didn't experience any arm,wrist, or elbow pain at the end of the session. I have approximately 65% life left on the strings based on the notching on the mains in the sweet spot.
Third day of hitting 8/26/20-3 hours
It appears the stringbed tension has plateaued at this point. I'm still able to hit with as much spin and pace while being able to control the ball as I did during the second day of hitting. Usually Solstice Power Teal would be uncontrollable at this point but I believe what has been advertised is true, that this Solstice Power Black has better tension maintenance than Teal. My Main string snapped towards the end of my hitting session so I clocked in 7 hours with this string before it broke, which was the fastest I have ever popped a string. I usually snap a regular full poly setup within a week and a half.
Conclusion
At $14.95 a set it would be hard decision to choose between Solstice Black and what's in the market in the world of soft, textured, black polys. Lower priced alternatives would include Kirschbaum Pro Line II Rough,Kirschbaum Xplosive Speed, Dunlop Black Widow, Tourna BHB7, Genesis Twisted Razor just to name a few which would be comparable in all of those categories and are lighter on the wallet. At Tennis Warehouse there is a deal for Teal Diadem Solstice Power for $9.99 a set if you buy 3 or more at the time of this review and if I were a first time buyer without ever trying Black, I would choose the Teal just because of its price point. Maybe Diadem can offer a similar promotional deal to see if Black will sell as well or better than the original version so at least the first time buyers would be able to try it to compare and if they make it their go-to setup, then at least they wouldn't have to break the bank doing it. If I were to try Solstice Black again, I would try the 16L or the 16 gauge for better durability. I was happy with the string for the 7 hours I had it in my Phantom 100x 305G but it just didnt last as long as some of the other strings I have hit with so from a price to playability stand point, I wish it were more affordable and then I would make it my permanent setup. I also did not experience any wrist/arm/elbow pain during the entirety of the playtest.