To give a more complete account, let me add.
I have ridden only one Alan frame, about five years ago, on a bike that I was able to borrow and which had been young Cipollini's, when riding in the Fanini team. Still holding on strong, though light and 'harsh'. Certainly, for years the Fanini teams have used Alan frames, on both road and track bikes; in fact there are still several used track framesets out there, for sale, and I have seen none of them broken.
On the other hand, to my knowledge, Ernesto da Cambiago used to have Allan compose such sets as bi-tubos, of which I have an un-glued specimen, to my great regret.
Sergio
Pisa