Hi everyone, This board has given me a lot of info so it's time for me to give some back Okay i got Blue Gear Ultra Blue strung at 58 on my Vortex ES 100 and all i can say is WOW! Spin- Not as good as i had hoped for actually. You would think with all the texture and twisting in this string would give a lot of "effortless" spin but this string does not produce spin for you so you still have to work a little lol but it gives very nice "controllable" spin. I'd say for spin...7/10. Power- I wasn't expecting it but this string gives some very good pop! The thing i love about it is it's controllable power because of the spin. 8/10 Control- I think BGU really shines hear, i haven't had this much control with any string i don't think. Really good! Pinpoint accuracy, the tennis balls and lines have a magnet on them! Never hit a ball out, just in the net of course. 9/10 Comfort- This string is stiff. I would definetly not call this string comfy! Wrist hurt first 10 minutes or so until i got use to the stiffness. After that no problems though. 5/10 Groundstrokes- Really great! Could hit really hard with it still going in! 9/10 Serves- My favorite thing about this string! Lots of spin on them(especially slice) and could really serve some bombs because of the extra pop! 10/10 easily. I think i covered everything but feel free to ask questions! Bottom line- You need to try these! Very impressed!