As a long-time Anker fan and Amazon tech reviewer, I believe that I have the experience and tools to test out these new earphones from Anker. The earbuds/headphones I have reviewed in the past generally go through the same process: I analyze the packaging, build quality, comfort, sound quality, and extra features (in that order).
Packaging is relatively simple: were the earbuds well-presented and free from damage? If the answer is yes, I will usually move on from there.
As far as build quality goes, I can usually tell from experience if a pair of earbuds is well-built. The earbuds' weight, cable length/type, paint, finish, etc. all play a role in this category.
To test the comfort of the earbuds, I simply use them for an extended period of time (1-2 hours). I've learned that earbuds will often be obviously comfortable or uncomfortable from the get-go (unlike some headphones that take a while), but I like to do a extended time-test just to truly test them. In my experience, this is a tough category to nail.
Sound quality is a complicated topic, but I've developed a routine that I now swear by. I listen to three song samples on the earbuds, all of which have drastically different sound signatures. I'll then listen to the same songs on two other pairs of earbuds (one that is similarly-priced and another than is more expensive). This allows me to get an unbiased and holistic view of the sound quality.
Usually earbuds don't have many special features besides a built in mic or in-line controls, but the Spirit X's are a bit different! The special feature category for these earbuds would require me to complete the SweatGuard Immersion Test - basically soak them in whatever liquids I can find. I'll probably do a timed water submerge test, spill some juice on them, and take them to the gym with me so I can truly test the SweatGuard promise.
I'm excited to have the opportunity to potentially review these earbuds! Anker hasn't disappointed me yet, so I don't expect this to be any different.