I play for over half a year intensively with various sets Crossboule (hence the review in several articles), also at various events where a whole day a dozen sets were in use ... not once was there anything defective. Of course, it may happen that a seam rises, as with all such products. Zoch has also stated that it probably occurred more often in the first edition 2011, and they have improved. However, (certainly different than with cheap products) Zoch absolutely accommodating. Just send in the Zoch website under "Service" / "Spare parts service" a short mail, then, comes replacement even with own fault (I once had a ball lost in the forest - somehow untraceable Three days later replacement was there).
And I do not want to doubt what the other review here on leavened seams. It's just that naturally a disappointed customer a lot more posting something to make air, while the "silent majority" of satisfied fans not so visible ;-)
Have fun playing at home, in the garden, in the park, on the road, on vacation, at the office, in the woods (but well pay attention to the balls!) And everywhere else!