The Poby L/S is great for its price, one can convert between them using the leaf for the housing to accommodate either the 26650 or 26350 cell.
There are a few WPA options for the Poby S configuration, some may not be within tolerances to make a good seal though. I got two figuring one would break and I needed to add an o-ring to one. You can just fit a hose over the stock housing's mouthpiece and run that into a bong but the airflow suffers obviously.
If I'm somewhere the bong + Flower Kettle can't go, it's a reliable concentrate device for me. I can believe quality control isn't perfect but JCVAP have demonstrated some degree of competence in other products and here while iterating on the Poby V1 I think.