Are there benefits to vaping with an RTA rather than a stock coil tank?
1. Cost. Manufacturers' coils are pricey. Building your own coil and wick is cheap as chips
2. Reliability. Mass manufactured coils vary in quality and you get the occasional dud. If you make an error with your rebuild, you just make another.
3. Supply. With your own stock of wire and wicking you no longer have to worry about the specific manufactured coils not being available any more.
4. Coil spec and variation. With a huge range of wires and wicking available you can make whatever coil suits you and the atty best.
5. Juice flexibility. Depending on your RTA's juice flow design, you can set up a wick to handle a greater variety of juice types - you're no longer limited to 50/50 PG/VG.
One tip I would share is to choose an RTA which has deck options and/or where you can buy extra decks. Having a spare deck with fresh coil and wick which you can quickly and easily install is a godsend.
There are some cons to think about.
1. The cost of the initial outlay - for wires, wicking, tools - can be offputting. it's a worthwhile investment if you commit, and few regret.
2. Time. You'll get faster as you gain experience but initially it takes more time than pushing a fresh coil out of a blister pack.
3. Mistakes happen. Don't be put off by less than perfect results from the get go, persistence pays off.
Also, are they difficult to learn how to use?
No. If you have the dexterity to rewire a plug you can wrap a coil, build and wick. The most difficult part is not the rebuilding but learning the workings of whatever RTA you choose, its strengths weakness and idiosyncracities. Again, persistence pays off.
There is a learning curve but it's not steep. Most folk who start rebuilding will comment on how much easier it is than they thought.
Oh, and are there better MTL RTAs than the Innokin Ares 2? Need them to be simple to use lol
Who knows what RTA will suit you best? Most are pretty simple really.