Based on Dusty's "seal of approval" I got a 30ml of Dusty's Blend (Double Shot) - I rarely buy a new juice in 30ml since I'm fussy and hate ending up with 30ml of a juice I don't like. I did a quick test drip when I got it and actually did a happy dance.

Then I forced myself to let it sit for a couple of weeks.
I started off by dripping it on an IGO L and have now moved onto filling a Protank with it. It is fantastic in both. The IGO is obviously stronger, but since I can't bring it with me when I'm out, the Protank works perfectly. It may mute the flavour a bit - but DB is an intense flavour and still comes through like gangbusters.
It's been at least six months or so since I've had the original GB, so I'm going from memory - but this is pretty close. I don't remember there being a strong rum base in GB, more fruity and the cinnamon was definitely more "in your face". That being said - I'm loving Dusty's Blend. I'm getting a strong rum/fruit base with the cinnamon - this is strong tasting juice, with some complex flavour combinations and I'm finding it slightly addictive.
I'm a finicky vaper, and tend to swap out juices a few times a day when I get tired or bored with the flavour. The problem with the cinnamon based juices is it seems to kill my taste buds for other juices and makes it hard for me to switch over to another juice after vaping the cinnamon juice. But I'm enjoying the DB so much, I'm really not wanting to switch out flavours anyways.
MLV is swamped with orders these days, so I'm seriously considering getting a 120ml of this stuff and I *never* order in bulk.