I've been using the RPM Blast and well .... having a blast with them. Fantastic strings! Being a top spin fanatic I love the crazy amount of spin I can generate with these but the durability is terrible. It has to be just as bad if not worse than pure gut. Is there anything like the RPM Blast strings but with a little more durability? Before the Blast string I was using a PHT/VS hybrid setup which I may have to go back to, just for durability.