The League One outfit squandered a 2-0 half-time lead but won 4-3 in extra-time.
"As a perfectionist, I did not enjoy conceding three goals," Di Canio told BBC Wiltshire.
"But we have to put this game as one of the best in the club's history. In the first half, it looked like Stoke City against Barcelona."
He continued: "I don't want to exaggerate but I have to say this. It was a shame we went in at half-time with only two goals. It should have finished 5-6.
"To win like we did, you have to have fantastic quality and spirit. Those lads deserve this result. It was a good and fair result for them after what they did in the game."