I tried various types of strings since I started to play tennis. I had tried the super expensive and the relatively inexpensive strings. The Prince Syn Gut is by far the best strings. I mixed this string with the Tecnifibre strings to get the power and touch combo that many intermediate players like. For $5, y ou can't go wrong with this.
I string a lot of rackets for folks in my area. This is the most requested string even with all of the new string types available. It is very easy for the stringer and very durable and predictable for the player.