MOMENT lenses are excellent, but I recommend to also take a look at SANDMARC...
I've been using the wide angle on my Xs for a year and the shots are amazing. It beats carrying a dslr on trips.
Absolutely agree! I find myself using the iPhone most of the time rather than the DSLR. Sensor size is no longer relevant these days and the remaining advantages that the DSLR provides are often not worth carrying the additional equipment. Also, the missing wireless link between DSLR and smartphones is a major issue in usability (and, yes, I'm aware of WiFi SD Cards). Last but not least, I've found the iPhone to have superior dynamic range. To get a similar result using a DSRL one would have to do manual HDR, which in comparison is a PITA.
(Kindly advise which equipment was used to shoot the picture shown! Thanks!)
$120 each?

May as well get a dslr.
If you want a decent DSLR 120 isn't going to get you started and each lens will cost at least 200, more likely 300-500.
While the lenses are not loosing value over time, it's a lot of money you need to spend for equipment that you will have to carry additionally. Last but no least, to take full advantage of a DSLR you will need to postprocess the RAW, which requires software, skills and time. For hobby photographers, these days I would rather invest in high end smartphone lenses.
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B2T:
IMHO Apple should include a distortion free (software assisted is OK) 14-16mm native lense in the next iPhone... In most situations you want to capture the moment (or view) -and this is where wide angle is crucial. >24mm is not going to do that. => You need at least 90° horizontal FOV, preferably 120°
Having a (just a) 2x "tele lens" is BTW almost completely useless from a photographing perspective. You can as well get a little closer and/or crop. The only purpose of the tele in the iPhone is depth measurement.