I have a set of the MIP 1/4 drivers (1.5, 2.0, 2.5) that are 2 years old and going strong. I did manage to break the 2.5mm trying to remove a dead screw which shows just how strong the tips are. The regular Losi wrenches I have rounded out within months.
I've been using EDS tools for the last 18 months that have have worked perfectly and show no tip wear. The only thing I don't like is the set screw can strip out the handle if you aren't careful. For my Serpent kit I picked up a complete set of EDS 1/4 drivers and those work just as well.
The MIPS sets are $12 per tool with the EDS as low as $6 individually or slightly more per set (weird!).