It's comparable to SPPP and Big Ace, but I would consider it a bit better in overall performance and quality. Seems to hold tension much better than Big Ace, is a bit crisper, and plays better than SPPP.
If I had to rate them in terms of overall performance:
Silverstring
Big Ace
SPPP
They're all spin friendly, but if you're looking for ARM friendly, then Big Ace might be the best option, with Silverstring and SPPP tied.