I have been using this Kirschbaum string for about 5 months now and I really like these strings. I have two of my 4 racquets strung with the Pro Line II. It is very durable, last a long time with minimal stretching, it plays well, good for power, drop shots, spin, etc. I have been using Technifibre multifiliment up to now and find it wears out in a short amount of time and it is very expensive. I plan to use Pro Line II in all my racquets from now on. I like it very much!