Nice one! A friend also jumped on the 420 deal and we've been enjoying it. I have a pnp and agree with your comparisons.
We've gotten a better handle on the hammer - e.g. recognizing ignition by sound.
We do have a couple of concerns: First, the hammer needs refilling about every 2 stems. This seems excessively frequent. Typically we'll find the roar sound to be less or inconsistent, then we'll look at the tank window seeing it at certainly less than 1/2 full (say, a 1/3 or 1/4 full - hard to precisely say). Then we refill - often purging first. We have on occasion ran the Hammer down to non-ignition.
Second, I personally find it a bit inconsistent both in its roar sound and performance - sometimes its a sputtery roar, often the roar quiets way down to a shhh after a few seconds. A more consistent and louder roar may indicate better performance. Sometimes we're able to cash a stem quickly, other times it takes some time to brown out. We may try other butane - i.e. Newport instead of Calibri. The fuel setting doesn't seem to fix this inconsistency. We start with it set at 0 and gradually move it up through the session to 75 or 100.
I really like this little vape. So far, it meets my friend's needs - inexpensive, effective, and unfussy. I also think it's near 1-hitter-ability is very impressive and also key for my friend. He's still combusting and will probably continue doing so, but the Hammer may be earning a place.