I personally normally vape higher vg juice and get most flavors in 70/30 (note Ahl lists VG first so that is 70vg/30pg) knowing they really benefit from a good steep. I try them fresh then put them away for 2 weeks or more. The tobaccos, however, I order 50/50 and get better flavor than 70/30. I think most recommend 30/70 (vg/pg) but I do better with higher vg and a longer steep. They do have a knack for making higher vg flavors simply awesome.
If you order $20 or more not including the Xpress line or aromatics you are entitled to a 10 ml sample. Someone please correct me if I am wrong. You just put your request flavor, nic level and vg/pg ratio in the comment section. Not all flavors are available as samples; it will say in the description of the flavor.