Yep no car problems. The only 2s failures I’ve noticed have all been with my battery packs and not the cars. The circuit boards have had no problems at all with many hours now of playing around, the other day when I was testing out the 2s pack as mentioned above
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The weather cleared so I finally got in some good rough terrain, hilly, off road battery sucking tests. I managed to overheat the 7.4 volt 2s pack fairly easily in the stock car causing it to turn into a slug, however the 3.7v 600mAh 2p pack was amazing, just picture a Micro-T pulling a little road kill action on the Energizer Bunny. In the ball bearing equiped brushless car the same 7.4 volt 2s pack did not overheat under identical conditions. So the success and your enjoyment of a 7.4 volt 2s Li-Ion pack will depend heavily on your car and the driving conditions.
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I ran it so hard that I permanently shorted the PTC on one of the 10430 cells running it over and over WOT up a dirt hill intentionally trying to kill either the car or battery pack in order to see what they could take, the car won. I’ve also ran it with a 2s LiPo pack and yep that motor gets hot.
The closest thing to a problem on the car side would be that 7.4 volts is a bit hard on the motor, so I drilled a small com-drop hole in my end-bell and every now and then give it a drop with a small syringe to keep from carbon coating the com, so far it seems to be working. I did rebuild the above car to make sure the drive train was operating smoothly but other than that, the battery compartment mod, and the com hole it was out of the box stock with bushings, not ball bearings, while I was testing it that is.