Hab flavour is ok IMO but far from amazing and sucks if too prominent in a cooked dish. It's too abrasive in something like a strong sauce and the similar but more extreme (in heat and flavour) Scorpion should (again entirely IMO) be reserved for sweet sauces and/or being a secondary ingredient for heat. I know people like both Habs and Scorpions for both heat and taste and I can't really understand the latter but I'll still respect someone who takes Scorpion over Reaper for flavour for the simple reason that it shows they actually care about the peppers, not just the capsaicin content. For that reason alone, I like to give people the choice.
As for Ghosts, well, they're an interesting little beastie. You can definitely taste the fact that they're part Frutescens but they still retain something of the kind of flavour you'd expect from a Chinense. Less sharp than the Scorpion or even the Hab and generally less acidic. They almost resemble the Scotch Bonnet in some ways but only almost and some dried ones I've had have had a sad bitter aftertaste to them.
What's most amazing though is how different growers and chefs can bring out completely different sides of the pepper. I've had Ghost sauces that tasted similar to Scorpion, Ghost sauces that had only a fairly standard (but pleasant) chilli flavour to them and Ghost sauces that were more lemon flavoured than any Lemon Drop or Aji sauce with nothing but pepper, vinegar and spices.
They're versatile, highly varied and almost always a great addition. I can honestly say I love the Ghost.
I don't love the flavour of the Ghost as much as I do the Reaper, mind you, but the Reaper was clearly bred with taste about as far from the grower's mind as possible.
Its heat is too strong to go with most things in large quantities and its flavour is too gentle to be at all prominent in low ones. And unless its balanced out with sugar, the heat that it has comes in so sour that you just can't taste anything else.
I had a 66% Reaper sauce and its flavour was absolutely divine but also gone in under a second when the sour hit home. Would not reccomend.
So, if I were you, I'd be well glad you got a Ghost as its (IMO) by far the most easily enjoyable of all the mainstream supers. Except maybe the Viper or the press BS that was the Komodo, I've never tried them.
EDIT: Oh, right, Bedfordshire Naga. Didn't bother mentioning that because it's practically Ghost anyway.