I used gear diffs in the front and rear of my DB-01 last year; inside and out (and the bit of the year before when they were released). This was with a HPI Flux 7.5 (mid timing on motor and a bit of extra timing and boost on a Hobbywing 120A speedo) and had no problems at all with them.
I just changed the oils a couple of times as I had a small amount of seepage (probably due to me overfilling them) but had no problems with the internal gears wearing and slipping.
I did find that as there was no give in them at all compared to a ball diff I had to run the slipper tighter then I would have normally done with a ball diff so you may need to bear that in mind.
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