While i have no idea about the quality of Miroku and other Repro Charlevilles, i am currently working my way through refurbing 100 of the "Indian Pattern" repros here in the UK.
If at all possible, and especially if you intend to enjoy "live" firing with it as opposed to just blank charges at a reenactment, then i would strongly urge you to stay away from the indian ones, and if you can get a Pedersoli or similar.
The locks on the indian ones are of terrible quality, i will take some photos tomorrow and post them to show this, rough cuts and tool marks all over the sears and stirrups, and springs that needed retempering, or just plain tempering, straight out the box.
fit and finish is also sadly lacking, so if you have no option but to go for one of these then it would probably be best to factor in the cost of a decent lock from a reputable manufacturer, or a LOT of time tuning the lock. Now i dont know how much your time is worth to you, but for the state of some of the locks i have seen so far if i wasnt being paid handsomely to do the work, i would have been swapping the locks straight out and putting the indian locks into the "background" rubber rifles.