Gone Troppo an 'unknown treasure'? It's the one I should get last. It's unknown and that's not without a reason.
Well, I agree with this review:
Gone Troppo (October 1982)
"This was George's least commercially successful album. It seems that George released this album quietly, doing little or no promotion for it. [...] . Such was an unfortunate fate for what was actually George's best album in a while. Several of the selections were gems. [...]"Wake Up My Love," could have and should have mixed in well with Top 40 radio of the day, and only one play of "Dream Away" [...] was enough to secure its melody and hookline a prominent space in the conscience [...]. The softer "Mystical One," "Unknown Delight" and "Baby Don't Run Away" were very pleasant to the ear. [...]. But, as stated before, George did not make much of an effort to promote this album, and all these fine new recordings went unlisted to. Radio simply ignored it."
After all, an album with (3 out of 10): Wake up My Love, That's the Way It Goes and Gone Troppo included in his "Best Of Dark Horse 1976-1989" (3 of 12 - because 3 of the 15 were 'new' songs) couldn't be bad or his weakest one, but there are some others like the named above that are quite good IMO.
Well, I considered 'unknown' because... it's obvious and above and a 'treasure' (always a subjective thing) because ... it's obvious and above too.