I've used their black cherry, vanilla, banana, strawberry, blackberry, caramel, cappuccino, brandy, been happy with them. Generally run about 8 - 10% of a given flavor in a given mix. I've primarily been doing VG mixing, using 5% alcohol (my nic base is straight VG, not PGA thinned).
(Their hazelnut is a bit weak to me, I prefer faeries finest if you want a PG-free one, though it is still weak compared to, say, a cappela.)
In PG I've only worked with the vanilla and black cherry, at 8 - 10% with Seedman Commercial tobacco (PG-based) at 12%. For those mixes I still have my VG nic, skip the alcohol and am using straight PG as the filler, so I am nominally running them at about 70% PG (between the Seedman and the PG filler).
I haven't had thickness issues, though as a carto person I probably notice it less; the juices seem to be about like other mainly PG ones to me.