No, for low wattage, MTL vaping, please use the higher resistance coils--1.6 and 0.8Ω. The .5Ω coils are for restricted lung, high(er) wattage vaping and are also somewhat problematic.
The coils last for quite a long time--depending on your usage, of course, and on the type of eliquid you're using--dark, sweet, heavily flavored juices will leave nasty deposit on your coils in a short time, while clean and unflavored juices are very gentle on coils. You can rinse then a few times under running water but they are disposable, As soon as you feel that the coil is struggling to produce good flavor and vapor, you'll need to grab a new one.