I've been using these cables now for 2 years - mostly in live circumstances, but also in studios. 10 metres is a handy length on the stage, as the stages I usually are smaller in width than that. These XLRs have been handy in connecting monitors into a mixer, as artists tend to want to adjust the placement of the monitors, and sometimes 6 meter cables might not have enough slack to allow the monitor to be moved around very much.
Considering the price and the quality of these cables, I have to admit that I've been positively surprised. You can't mistreat these cables a lot without consequcences, but when treated carefully (as you always should with all your gear!), these cables will last. The connectors on some cables have had some minor issues with the locking system, but that's nothing that would have affected its performance in a significant way.
You should never pull a XLR-cable from a mixer by pulling from the wire itself, you should always remember to pull from the connector. That's a way to break this cable, but luckily some soldering will fix that issue.
Considering the price, reliability and quality, I'd definitely buy these XLR-cables again. You can probably get better quality cables for a larger sum of money, but 6,60 euros is an unbeatable price for this entity.