Nope, never used the tfv8. Just about the only things I use are RTAs. I avoid factory coil stuff, at first out of fear for regulations in the US making them difficult to obtain, and then just because I can build a better performing coil for pennies compared to factory stuff. However, I do use factory coil tanks for things like traveling as they are simply easier to work with, and I'd rather pop something out of a blister pack than rewick a coil in a hotel room.
The Smok tanks are on a great roll between the Baby Beast, Big Baby, and now the tfv12 coming out. I've read good stuff on the tfv8 as well. Coils tend to be expensive, and generally require more power than say a Crown. If you do decide to get into building, I'd strongly encourage you to go with a dedicated RTA rather than an RBA head for a tank. The decks are bigger and easier to build on, and most RBAs are simply compromises built to fit regular tanks (as with anything, not all).
If you want to get into SS TC, I'd suggest a higher end mod like a DNA is the way to go. I do get reasonable SS performance out of my Alien, but it's not the same. I also only use my Pico in wattage mode. Some folks do use and like TC on it, but I'm not a fan. Adding in any issues specific to the coil you're using just makes it that much harder to sort out. The good news is if you use SS, you can go with wattage mode on mods that are not terrific at TC, and TC on those that are. It's just way more versatile than say Ni. It's also way easier to build your own coils with, so I view it as a win/win for wire selection.
And good call on the charger. I use a Nitecore, but have read a ton of good stuff about the Xtar here as well.
