I have tried 3 of the Castle Forbes scents. Here are some impressions I posted about them on another thread a little while ago. I've re-sampled them since posting that, but haven't really altered my views, except that I've decided that Lonach is unwearable for me (I find it just too sweet and cloying, and an uninteresting fragrance to boot. But some folks with a very sweet tooth might to drawn to it). The Gentlemen's Cologne and Keig are frags I find wearable, but I don't rate them highly enough to consider investing in a bottle/decant. But good luck if you want to experiment with them.
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I've tried Gentlemen's Cologne, Keig and Lonach. They were all OK, but I didn't like any of them enough to spend my hard-earned lucre on a full bottle.
My overall impression of Castle Forbes fragrances is that they're simply not distinctive enough to be must-buys.
Gentlemen's Cologne is a fairly traditional-smelling combination of citrus and woods. It's pleasant enough, but I always have problems remembering what it smells like unless I pull out my sample again. That's usually a sign to me that a fragrance is not particularly distinctive.
Keig is a more green/ferny style of men's fragrance with a slightly sour quality when you first apply it. I liked the sourness - and overall I probably liked this the best of the 3 I tried. But Keig didn't have that "wow" factor that often prompts me to buy a fragrance. Again, I felt it lacked distinctiveness.
Lonach - this one is quite sweet. Perhaps too sweet for my nose. I'd describe this as a gourmand-style scent, although I've also seen it described as a "smoky oriental". Personally, I don't detect any smokiness in it, and it's certainly not as spicy as many orientals. I wore this to the office once, but ended up washing it off, because it became too cloying. If you like your fragrances sweet, I think there are many better, more interesting choices around than Lonach.
Overall, I wouldn't put Castle Forbes' fragrances in the same class as Trumper's. I don't find Castle Forbes' stuff as interesting as Trumper's, and they lack that up-market, high quality feel you find in many of Trumper's fragrances.