Tsintsadze is a great composer indeed. However, the early Fantasy for Piano and Orchestra (which I don't know so far but I do know other pieces by him which were composed at about the same time) is hardly representative of his ripe style. I think that at the beginning at the 1960s he had found his own voice and that's definitely nothing in post-Rachmaninov vein but rather based on Shostakovich, Bartók and maybe some serial procedures. Actually that's quite tough stuff from time to time with a notable degree of dissonance. I wouldn't call Tsintsadze a modernist though he was interested in innovations and his music is far more modern than Taktakishvili's who was just one year older than Tsintsadze.
Tsintsadze used to play the cello, and he was definitely an expert in string writing. There are twelve string quartets in his output, of which I know all but the last one and they are highly interesting in my view. Two of them have appeared on CD, by the way (Nos. 6&10). His Cello Concerto No. 2 is a terrific piece as well.
His most prominent pieces are his arrangements of Georgian Folk Songs for string quartet, however, though these are actually pieces which don't belong to the centre of his creative output. Nevertheless, he did an excellent job here, his creativity in writing for string quartet is remarkable and these little miniatures are really great fun. The cello pieces mentioned above belong to the same category, while the Fantasy for Violin and Strings which is available on CD is based on an opera by Dolidze (Keto and Kote).
In fact, the only ambitious mature works by Tsintsadze which have been recorded on CD are the two string quartets I mentioned above (and even them do not seem to be available any more).
I like his music because of its energy, its balance between ratio and emotion and because it's very well done. However I understand that people who love romanticism rather than 20th century developments might have their problems with his later output.
By the way, as far as I am informed Tsintsadze already died in 1991 (not 1992 as indicated in the title).
Regards,
Holger