I like them. Really nice colour scheme and the vehicles look well used (i.e. have run over lots of enemies and had quite a few lovely mud baths). I like the tracked big guy from your previous post a lot (is it a Terminator?). It reminds me of a very souped-up version of the robot from Lost in Space (Danger-Danger-Danger! - showing my age here). I have yet to use weathering powders (something I want to have a go at soon). How easy is it to blend the powders outwards from heavy to very light? Is there a particular medium you use to blend out the powders (water, turps, thinners, other?).
The tracked guy is a venerable dread. I have plans to convert a bunch of goofy looking venerables, using some of the mechnicum kits to give them spindly legs and stuff. That's a few months away though.
The powders are pretty easy to use, but seem to be quite hard to master. There's a few videos online to watch to get the hang of them.
The way I was using them, was putting a small amount down on a palette, mixing with a large amount of water (the powders are VERY strong), and then applying in the relevant areas. Once dry, you can manipulate them with a brush just by rubbing back and forth on the area. I've only got the 4 colours at the moment, rust, bone powder, dark dirt, lighter dirt.
The other method is to apply them powders directly then manipulate them with whatever. This seems to be the best for effects like rust streaking.
The dirt/grime i've used it a combination of paints, powders and the devlan mud technical paint from GW.
Anyone have a good guide/method for getting soot to look nicely? I wanted to dirty up the exhausts a little.