I've got a couple of the red ones (top link) in use, 6.5 and 8.5 (4wd/2wd). For the money you can't go wrong. Neither of them has missed a beat in the 3 months i've had them. Not done much experimenting with settings or anything, but they run just as well as the expensive motors that i replaced (i basically wanted something a bit slower and more predictable for indoors).
And they run plenty cool as well.
Last year i was running a couple of the ones in your second link (an 8.5 and a 10.5 IIRC) they were also both very good.
The 10.5 i still have but don't tend to use, the 8.5 i melted thanks to an oversize DEX210 gear diff, I got it up to 135 degrees C before the glue between the rotor and shaft melted!! (I still went out and bought more of them!)
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