So, in my personal view, I have had many different brand of RC's over the 4 - 5 years that I've been in this hobby. I personal have not yet owned a 1/10 2wd Arrma but My friend has a BLX Granite and a Mega Granite. I have a 1/10 2wd VXL Slash and my oldest son has a XL-5 Stampede (Now brushless) and I like the looks of the Arrma more, but have not seen them go head to head but twice. The BLX broke a rear link on the 3rd run, but that's it, fast truck and handles pretty good also.. The Mega seems to be the same as my son's xl-5 in many ways, but the Traxxas does not come with bearings, and I believe the Mega does, and metal dog bones also a plus. Everything will break, doesn't mater the brand, plastic, metal, or aluminum!!!
I have also heard about people running lipo's in the Mega's and saying that are not good to use lipo's with, but I feel that it's also about how they use it, the amount of power the lipo is putting out that also has to do with how good or long the esc last, but that's just my thinking on this issue. It really comes down to your personal option on which one is best for you!! Very important to let the brush motor break in at a low speed as the guy said above!! I would to the water or just use the throttle trim knob to power the motor while running it at a low speed for at least 15 minutes, or so. Or the water break in .is good also
I did just get my first Arrma about a month ago, 1/10 Arrma Senton 6s SCT, which I like but needs better tires, only used it 3 times so far though, but loving it!! My friend also has 2 Kraton's and 2 Nero's, which are some seriously awesome RC's!!