I have not tried those but look me up on ebay resell-it user id.
I have bought the EC power for 25.00 3200 25c , 4 of the yeah racing 2 x 3200 and 1 x 4000 and 1 x 3600, 1 smc 3200 and 1 venom 3200 .
I can turn the same exact lap times with each pack . NO DIFFERENCE
The other racers at my track have started buying the other lipos now that they have seen mine run. I had an orion 3600 but got rid of it because of the different balance port but it ran the same as the others.
I DO balance charge at every charge and they all charge up to the rated capicity except the EC power which will not charge past 3174mah. but it runs strong.
so far I like the yeah packs the best as they have the most solid feel and i have used them the most at around 45 cycles so far. I run a sphere with a lrp 13.5 and mod brushed before that.
I use the newer triton EQ balance charger. Very Happy with it.
I would buy in this order Yeah, smc ,venom , ec power.
I like the look of the smc carbon but yeah quality is great too
longevity is what I am watching for now
Be sure to use the Maxpro 2s lipo monitor too. on the bay.