I got some VG from Walmart and vaped that straight for awhile. Tasted sweet and was kind of a nice change vaping something that didn't have a strong specific taste. But had to stop as the VG seemed to affect me, seemed to affect my breathing, felt like I was back on analogs.
Never tried PG straight and have also been told the VG I used was lesser quality compared to what others use for DIY, ymmv.