[jhautz]

I run the 1512/2.5D (2000kv) on 5s and it runs all day no issue. I started off with a 1515/2.5D on 5s in my Revo and wound up swithing to the 1512/2.5D. I like it better for the type of running I do most of the time. The grearing needed is a little different for the 2 motors, but I can run gearing that gets me another 5pmh without thermalling over what I could get with the 1515/2.5D. Plus, overall it has a snappier feel to me, which I like. The 1515/2.5D probably has a little more low end grunt, but it really cant be used unless you have a really heavy truck. I can spin the tires or flip the truck instantly (depending on traction conditions) with either motor so extra low end is kinda useless anyway.

If I put it on the track, I run a 4s setup and it tames it out a bit and makes it a little more driveable.

Just my $0.02. I'd vote for the 1512/2.5D.