I haven't drilled any of mine out yet (got another couple en route, then I'll start to experiment).
But one thing I have noticed from early experiments (only had them a few days, so take with a grain of salt...) is they seem to be *extremely* sensitive to coil placement. I can only assume it's because the chamber is so small, small movements of the coil are proportionately larger.
That's good and bad - it makes the build a little more exacting, but gives you more 'tunability' afterwards, because you don't have to distort the coil or damage the legs to nudge it around and get a different vape.
Very good flavour though, I reckon.