I have one Armi Sport, a Euroarms, five Parker-Hales, a Peterosoli 1863 Springfield, Colt 1862 Musket, and an Armi Sport Percussion Sharps.
The only difference I could find with the Armi Sport 1853 is the barrel bands. They aren't as smooth as the Euroarms or Parker-Hales.
They might have changed the bands by now but they Armi Sports weren't as nice to handle with the bands. You would have to look at them to appreciate the minor difference. They all shoot well and if you are into living history get a good Uncle Mikes SS cleaning rod with a bore guide, carbon scraper, and jags.