Having strung professionally...
...for a number of years at both the club and retail levels, my opinion of textured strings is not a very good one. As many experienced stringers and players will tell you, the ammount of time the ball spends on the strings is so short, the extra wrap/roughness of a textured string most likely will have very little effect on the ammount of spin you put on the ball...if any!
When ever a player came to me looking for extra spin in his/her game, I always steered them to playing a thinner gauge and/or more playable string. The key here is to create a softer, more playable "pocket" that would allow the ball to dwell on the strings longer so that more spin and action could be applied. Also, by going to a thinner gauge, you open up the string pattern on your racquet more to help increase bite on the ball. Need proof?
Many of the textured strings are stiffer, thicker-gauged strings that can't hold a candle to the more playable multis or poly out on the market. That's why the advent of poly caused such a stir when Luxilon became so popular on the Tours...here was a string that was so playable, the pocketed the ball so long, the spins the Pros were applying changed the game over night. Heck, the most playable string out there is still Natural Gut and you will never get anyone to say that a textured string can apply more spin and be more playable than Gut.
If you want spin, change out to a thinner gauge, more playable string and refine your strokes. The longer the ball stays on your strings, the more spin you can potentially apply.
Just my $0.02...
Arvin
