I love the striker fired inlines. I've a real fondness for the TC Black Diamonds. I have 2, both XR's. One is a blued .50, the other, a stainless Super 45.
I started with a Traditions Tracker, which my daughter still uses, and had an Mk 85 Knight and a Knight American. Both good, but I like the Black Diamonds better.
However. I recently got a TC ThunderHawk .50 stainless and I think it's the best of the bunch. Superbly accurate and handles better than ANY rifle or shot gun I've ever shouldered.
I also actually prefer the fixed plug to a removable one. Once you get the hang of it, its no harder to clean. If you're used to cleaning side locks, its a breeze.
All of my TC's came with Tupperware stocks. It took some searching , for the 45, but they're all wearing walnut now.
A several advantages of striker fired inlines are: they're legal everywhere, generally are well bedded and quite accurate out of the box, they're very simple and easily maintained and they have full lenght rammers.
True, BH 209 is a no no, but Swiss ( Holy) black is a very fine and reliable powder.
I've gone all muzzleloader and all my rifles are striker fired. I doubt you would be disappointed with one.