I have no reason to feel one way or the other , but it's worth noting that all the "failures " with Indian muskets are from Reenactors. Italian muskets have failed to. In short, some reenactors don't properly clean muskets and a cement like build up in the breech area eventually creates a choke point, blowing the barrel. An original musket will do the same.
If someone can post a link to an injury from an Indian musket failing under live fire it would be informative .
That said, I feel they're too expensive for what they are. $500 for a P53, some of the big flinters are almost $700???
If you want a low priced front stuffer you can find good, used T/C Renegades for $250, or a Zoli Zouave .
Or just pay a few hundred more for an Italian.
If something like an 1842 Springfield repro , that was safe and shootable, made in India and priced at $300 then you're gonna have a good entry level option. $650-700? No thanks , I'll just put that money down on a deposit for something cool like an 8 Bore October Country rifle.
Places like Loyalist and Veteran Arms test fire the pieces , I don't know if they're "proofed" or they just pop off a round ball with a 60 gr charge and call it good. Middlesex Village charges a pretty heavy fee for "Proofing" but he does offer it.