Joel2718 on 1/21/2010
The pips are fairly grippy but still generate good spin reversal if you are blocking close to the table, and overall they are excellent for chopping far off the table, as long as you like something with a bit more grip and a sponge (... this review is for the 1.0mm version, though I think they come in ox).
They took some getting used to because they are quite grippy, I had to change my stroke a lot, especially on first balls that come over with not a lot of spin. You'll either have to chop much slower, or change the angle a lot so that you don't 'pull' it down into the net when you are chopping down. Overall though I can still return with a lot of underspin.
The grip along with some different strokes/angles makes for good opportunity to throw in spin variation.
I usually like the feel of OX long pips, but I don't think I want to take the sponge off of these ones. If you angle your racket to be much less vertical on your chop, getting more under the ball, since they are grippy, you have very nice control to put it consistently back on the table. Its not necessary to chop like this all the time, but you always have to be aware that the grip will change the path of the ball, so make sure to match the incoming spin with your stroke for maximum underspin, or adjust your stroke accordingly. Overall I really like the feel of the sponge.
I used these pips on a Butterfly Primorac 2000 blade (or something like that, there's a few diff versions of that blade). I didn't use them for long though before I tried chopping with some short pips. Very soon though I'm going to put these back on, and i'll update my review if it seems like a good idea.
Downside of course is that they're expensive, but if you know what you want and think these might do the job, then I wouldn't advise against buying these. If you are like me though, and just like to try something different once in a while, well I wouldn't pay $45, that's why I bought them on sale for about $21.