The list of multis that I have been testing has started to grow to the point that I have decided to simplify it by creating a tier system to rate all the various multi-filament strings I have tested so far. This list is just a starting point for those who wish to consider the various brands out there. I am just glad I am not doing a poly rating system which hopefully someone else here on the board will tackle. Tier 1 Technifibre Biphase - crisp, powerful, decent control, plays stiff first hour and then settles in nicely until it starts fraying which will cause rapid tension lost. I get about 10 hours on the string. Price has gone up to $16. Alpha Gut 2000 - crisp, good control, decent spin, excellent value at $6. Only downside is durability lasting about 5 hours for me. Babolat Xcel Power - soft, decent control, does not fray, and is just a consistent string. Only downside is cost at $20. Technifibre NRG2 - crisp, good control, holds tension well. Not as powerful as X1 but doesn't fray as much and given the recent price bump might be the best value. Kirschbaum Touch - soft, comfortable, offers good control and has great durability. Tier 2 Tourna Irradiated - crisp, good control, but lacks durability lasting about 7 hours. Mantis Power - soft, offers good control and power. Volkl Gripper 17 - Comfortable, offers good spin and power but a bit difficult to string but lacks durability. Prince Premiere LT - After a few hours of hitting, this string feels really good for control and crispness but has durability issues lasting about 7 hours. Wilson NXT - decent power and comfort but lacks durability breaking about 7 hours. Tourna Quasi Gut - From all the positive reviews posted so far, I hoped to be one of them but the strings are just okay. This is a soft string so if you looking for crispness or control, take a pass. Durability is good but I cut them out as I found I lost of power and control after 8 hours of hitting with it. Tier 3 Pacific PMX - Good reviews from other users but I find this pretty average. It offers good control and is soft but doesn't offer much power and not a crisp string. Wilson NXT Tour - This was a crisp string but I did not find it to be soft on my shoulder. I just did not like how this particular string plays. Isospeed Professional - This offers good control but lacks power and feels muted. Pro Supex Maxim Touch - This is the newly formulated one which is no longer available. Will retest with the classic string. It initially played decent but now feels stiff and lacks power. Klip Venom - This offered great control but felt very stiff and hard on the arm.