The cable has the designated length of 1 m. For me 1.5 m would be better but this is certainly a matter of taste.
In some reviews of this Noname-magnetic charging cable is written assumes that the connection is not protected against reverse polarity, so the plug can be plugged also wrong about the phone and thus possibly damaged. This is definitely in the cable available to me is not the case. The recesses for the contacts are designed so that it can not be wrong to attach the charger cable around.
The charging time is after the original Micro-USB cable to little or nothing. Precisely, it took less than two hours to charge the battery from 33% to 100%. If you are interested I can also find out more detail.
The magnet holds so-so. You can use the phone while it is connected, but has to be careful, if you do not want to interrupt the charging process.
All in all, I forgive four star. There are departures for the magnet and the cable length:
+ Fast loading
+ Reverse polarity protection
o maintenance of the magnet
o Cable length
I realize that the cable length and the magnet was known probably can not be stronger but still these are restrictions that do not make this solution just perfectly.
Nevertheless, these are probably currently the best solution to be waterproof Xperia gently to load.