I've had one for 27 years now in .54 cal. It is still my go to rifle for hunting because of it's shorter barrel (easier carrying, but still not light!) when not using my flintlock. When it was new, and my eyes were better, I could shoot the occasional benched 5 shot cloverleaf at fifty yards using handcast maxi balls and pyrodex.
I've modified it over the years by restocking it with a longer, more traditional looking stock that fit me better, and by mounting the tang mounted peep sight that was supplied with it at the time and taking off the rear sight. I removed the peep insert to leave a large aperture, basically a "ghost ring" effect, much easier to see the sights that way in dim light, and bring the front sight and target into focus together. Also, the rear sight was mounted right at the balance point of the rifle when carrying it one handed, and the palm of my hand (maybe that's just me) would bump the spring loaded leaf once in a while, allowing the spring loaded elevation detent to disengage and allow the elevation adjustment dial to spin and change the elevation setting. Not good when hunting. The only other mod I've made to it is to use musket cap nipples instead of the #11 size. About twice the spark, and I reccomend it for any side hammer percussion gun.
I like the coil springs in the lock, they seem to be as strong as when the rifle was new. Not quite traditional, but I have seen flat main springs on cheap locks weaken as they aged, like an old Spanish made lock on a CVA I have. The double set triggers work well, and the hair trigger is adjustable. I'd be guessing, but I'll bet I've put over 2,000 rounds through it, if not 3,000. It will currently group 3-4" at 75 yards with hunting loads, without trying too hard. It definitely prefers conicals to round balls for accuracy, like sundance said.
All in all, you could make worse choices than a Renegade, in my opinion.
Ernie, how old is yours?