I have two TVM rifles, a kit gun in .54 and a semi-custom in .58 and I swear by them both. TVM uses the very best American parts and does an excellent job in construction. Mine have Siler locks, which give me the option of switching to Siler percussion and back again if I want. Make sure you ask about this when ordering. The .58 has a coned barrel that is very helpful in speedy reloading in the field. I use Thompson Center lubes (the yellow stuff)and cleaner. You can save the olive oil for the Pedersolis. I can go many shots without swabbing and the guns still shoot better than I can.
Building the kit gun was a real challenge. You have no idea how many problems you can encounter, especially with eight thumbs. My advice: keep looking until you find a gun that you can see and put to your shoulder and examine thoroughly before buying. This is not only an investment of money, but also your fun time. Get the right one, made in the USA.
"Therefore, let your gun be the constant companion of your walks." Thomas Jefferson