The Sweet Spot titanium wire I've started trying out recently is certainly clean and fairly easy to work with. There was no residue when wiping it clean with an alcohol soaked pad before coiling it. The wire has some modest spring to it, but that has been very manageable. It holds its shape very well, at least in 0.4mm (26 gauge) format, when you pull your wick through
coils made from it.
On the other hand it really doesn't vape clean. Which is to say it gets gunk buildup on it just like as any other coil wire I've used, but the gunk buildup does occur a little more slowly. Because it is titanium, it is more difficult to clean the wire when changing out your wick, since you can't just dry burn the stuff without a care like you would with SS wire.
I heat the coil up on one of my mods in TC mode with the max temp set at about 500F, then dunk the coil in cold water to shock the gunk buildup off of it. This works okay, but I still have to use a brush to finish up with cleaning the coil before I wick it again.
The coil does eventually come out "cleaner" looking than other TC wires I've used, but there is some effort involved. Doing this while out-and-about is a lot harder than doing it at home. Having a SS brush on hand helps. Plastic or nylon type brushes just don't do the job as well.
The titanium wire does run very smoothly in all of my mods though. Even my iStick Pico 75W mods deliver power fairly smoothly to coils made from this wire. My iStick Picos did not run SS very smoothly at all, but my DNA 75 mod had no real issue with SS. The DNA 75 still delivers power more smoothly when running titanium wire coils, of course, but I think that is to be expected.
Flavor is kind of a subjective thing. I can't tell any real difference between titanium, SS and Resistherm NiFe30 when
vaping. The 28 gauge Resistherm NiFe30 wire coils just tend to bend and break very easily, so that material can be a bit of a pain to work with. I've had no issues like that with titanium or SS wire coils.
Is the higher price of titanium worth it compared to SS wire? Power can be delivered to it more smoothly, allowing you to get a little more vape performance out of coils build from it, and gunk builds up on it a little more slowly. To me that is worthwhile for my chain
vaping MTL needs, despite it being harder to clean. It is probably not worth it to most people out there, unless they just want to try it out simply for the sake of trying it out.