I have a lot of experience from 1:8 TR, which use alu chassises. And yes, they definately do bend. Both from wear (gets banana shaped from all the accelerations and decellerations when touching the asphalt) and crashes. But they are the best solution in many ways. Stiff, light, cooling etc.
For 1:10 OR with much lesser speeds, less weight and "soft surroundings" bending should really be no problem. Of course if you hit a fence going flat out you'll break anything...
I've tested a big LiPo vs. a small one with lead at the bottom. You really can feel an advantage with the weight put lower. So a "heavy" alu chassis should be great.
Only downside: Will look like crap when all scratched up. Solution: Drop the anodizing!
As to diffs I think a pro would be just as fast with a ball diff. But for Joe Racer which is a lazy boy (like me), it'll be much better! Much less maintenance and working great. A worn out ball diff isn't sweet!!!
I really hope gear diffs will be available in 1:12 as well!!!
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