This is exactly what Mik said.
The puromizer is ment to be used with a Janty NEO Classic battery - if youre using an ego clone, your experience in burnt taste may vary, seeing as some of these clones are definately not delivering the balanced output that we want them to, in order to have a nice vaping experience with the Puromizer.
As far as we know, there is one problem - and this problem is limited to certain scenarios:
When smoking the auto batt, it helps to remove the silicone ring at the end of the battery (covering the LED) for those users who feel its getting a bit too hot/burnt.
Now, as for the rest goes, when people are using the neo classic batteries (auto or manual) with a good PG liquid, then there are minimal to no problems. The problems come from people using "PG" liquid, that is infact a bit too thick, or from using mods with the puromizer that deliver too much voltage/or clones of the ego, delivering a non balanced output.
Just thought id set this straight. If you want the full NEO classic experience, get a full neo classic set, and use a good PG liquid on it (Janty / others that are infact PG, and not 50/50 mixes)