A good alternative is the Nokia 901. It may well be that the charging time is longer than with the supplied charger. It has anyway several charging options. In the car, in the office and at home bsplw. overnight just practically to the charging pad! When one did not hourly retrieve his e-mails, surf or chat must :-) is morning the battery is fully charged!
Also, I have the Nexus 4 does not constantly in his hand and when it is stored, it is on the charging pad without every having to connect the charging cable and is loaded!
Also, the "slipping from the bag" by luxurious Gorilla glass can by a "pocket rebel", who likes to be color-matched to the charging pad, prevents.