Hmm. Haven't read the entire thread but I am not feeling the love for Cyclone here. I have played with Volkl Cyclone for half a decade now in every kind of racquet you can think of. And with college level kids, not rec level uncles and hackers. It's a very well priced string that does everything well and doesn't hurt the arm (unless you string it way high). String it under 50 lbs in any racquet, and it's decent enough (minus the sometimes plasticky feel).
I mean yeah, it doesn't have the performance of ALU Power (what string does for the matter?) but it is priced accordingly too. Hyper-G is a great string and better than Cyclone, but it is also 12 bucks a set and the reel is 30 bucks more. Cyclone is much cheaper at some places and for a poly user who strings up often, the cost adds up quick.
Also, my local college team players get free Solinco strings so I have tried Hyper G in every gauge available. Lasts the same as Cyclone for me. Better feel and feedback sure, but when it comes to playability and duration, all decent polys are in same ball park, usually. Rule of thumb: thinner gauges are livelier and die faster. Thicker ones have less feedback/feel and not as lively. Neither lasts long once you start taking big cuts at the ball.
If a poly string is lasting you more than 10 hours, chances are you don't need poly because you don't have the racquet head speed to generate the requisite snap back beneficial to the user. No poly lasts longer than 10-12 hours of play for big hitters. You either break the string, or it dies and you get zero snap back which is easy to tell. Poly strings aren't designed for long term use anyway.