Here is my official review.
String Received: Gamma Ocho XP 16
Tension(s) used for playtest: 55lbs
Regular string set up: Topspin Concept Pure 50(mains)/45(crosses)
Racquet brand and model used for test: Yonex MP Tour 1 Mid
Control (predictable trajectory? easy to control depth? performance on different strokes and swing speeds?)
I felt the directional control was excellent. I had some difficulty to adjust myself to the trajectory of the ball using these strings, and I think it probably has a lot more to do with me. I may need more time with this strings to gain confidence on swinging full.
Down-the-line winners were a joy to hit with these. Had excellent feel on volleys. Hitting drop shots and touch-shots were a joy with this string. Also half-volleys, even when you were out of position and stretched out, turned out to be excellent, and kind of worked excellent for a serve & volley kind of style. Flat shots were good, and had tons of power, also they were landing with excellent control on where I wanted. But when I look for a bit more loop, I was not getting enough loop. I believe with a bit more time I would probably gain confidence on those shots. But in general I needed those shots to be reliable for my baseline game, and was not working out too good for me with the sessions I had. In-fact one thing which confused me is that I had enough spin on my flatish serves using this string to kick them high, so there was obviously some spin potential, but when I go for more of a “topspin” serve, again the trajectory was not what I was expecting, and I was not getting that high kicker I am used to.
High swing speed strokes, which usually lands well in were flying out for me using these strings, and I was kind of loosing confidence on them using these strins. But I feel like that I could adjust over a period of time. Anything with a bit lower swing speed was excellent with these strings (as mentioned above, touch shots/drop shots/volleys/half-volleys etc.)
Feel (Stiff? Mushy? Muted? Crisp?)
Crisp. Touch shots and drop shots felt really good. In fact any kind of shots with continental grip and less swing, felt extremely well (volleys/dropshot/half-volleys/stretch-shots/chop).
Spin
Average. Mixed feel about this aspect. I was not feeling much spin generation on my shots. But I believe the flattish ground strokes or serves had a lot of rotations, which matches with what my opponents were observing during practise sessions. A buddy of mine who is currently a user of another popular multi hit with my racket strung with Ocho XP thought, they were able to generate a lot more spin than their regular string, and even asked me to send them the string model/name (so that they can try it extensively).
Power
Excellent. This was a super charged Turbo. The power was excellent from this string. Outshined any other string I recently used in this category. Those stretchy shots, which my opponent attack me mercy-less which I usually dump to net, or just get it over to setup nicely for my opponent were a lot better, and forgiving, to eventually neutralize and get back into the point.
Comfort
Excellent. Excellent comfort. I never had arm issues with strings, but I did try some pretty wild (bad) flat swings, just to check the credibility of the “arm friendliness” claim. I am pretty sure those bad swings would have caused some pain for me in my regular strings, but were really no issue with “Ocho XP”. Also from the feedback of my friends who are already using another string which is know for its “comfort/arm-friendliness” mentioned that “Ocho XP” was having same comfort level.
Durability
Average. Not enough for me to use as my daily string. Probably this was expected anyway, since arm-friendliness comes at the cost of some durability. There was enough string damage after 6 hours of play time even though I was not doing my full swing most of the time with these strings.
Playability Duration (share thoughts on if/how the playability changed over time)
Good. The string bed characteristics changed drastically in the first 15 minutes or so. But if you consider that to be a settling time, then the string pretty much held its good and bad pretty stable over the next 5 hours or so. So I would say the “playability” was pretty good for for an arm friendly multi-filament.
Compare to the string you use most often
I do use poly strings (Topspin pure concept) regularly. I think it is probably unfair comparison to compare with a poly string. But I know that I can hit with more confidence with low powered strings, and had better control on the trajectory on the ball. But I could not imagine to do some crazy shots I made with the “Ocho XP” using my regular strings.
Tension recommendations (after hitting it, would you recommend a different tension? Why?)
I do not think a difference in tension would have made much difference for me. If there was another package I would have tried a bit more tension. But usually I like the pocketting feel of the string, so I do not think a tension difference would have made much difference for me about the love for “Ocho XP”.
List any additional thoughts (optional)
I think this is an excellent string for players at any level looking for an arm-friendly string, but still don't want to compromise much on the play-ability. The string is very forgiving and powerful. So if you are so used to swings using "low-power" strings there may be an adjustment period.