It's a good diff, strong and smooth.

The following models have rock solid diffs also

Jammin X1 CRT (potentially the cheapest and arguably the strongest)
CEN Matrix Arena/Genesis (well known upgrade for savage monster trucks, strong diff)
Mugen MBX5/MBX6 (Mugen make some of the best stuff in the hobby but will be a bit more expensive)

Truth is, most of the 1/8th buggy diffs are pretty solid, but since you're running a mini moto engine, perhaps you could consider something a bit bigger? Like a simple FG diff from their 1/5th scale?

To give you an idea what's available at the top end... http://www.bigboystoysandhobbies.com...etail/985/6427

But you can get less complicated diffs for a lot less than that...