No metallic taste from the Yocan. The coil is underneath the quartz cup.

I tried the concentrate oven with my Pax Plus, but I wasn't too thrilled with it. The little bucket and lid needs constant cleaning and I found it tedious. My Pax is just used for flower now.

As for the Terp Pen, it works okay initially, but then the coil tip gets gunked up, even if you pull slowly as recommended. It is also much more involved when cleaning due to the airflow design. I went through a few coils before switching up to the Yocan Orbit.

As for handling sticky concentrates, forget those dab tools and get a hot knife. Scoop with the knife cool, then hit the button to release the concentrate.