I liked the halo tritons when they worked, aside from being overpriced. After battling with halo over shit coils that wouldn't make it through a tank refill without burning out prematurely, they can keep them. I also like several of halo's ejuice flavors but again, prices are a bit high. The ones I used though were the original triton, the triton 2's weren't a thing yet.
Maybe it's just the longer I used them the more problematic they became but my mom and I both used the original tritons for several months. At first, awesome. Easy to put a new coil on, easy to fill etc. The coils with silica wicks lasted a good 7-10 days, sometimes 11-12 days.
Then while using the same juices (ie flavors or types didn't change to 'tank crackers' or anything), issues. The poly tanks on my mom's started cracking, first one then 2, 3, 4. A couple of my tanks cracked but for some reason my drip tips (which encloses/seals the tank) began cracking up the side and the threaded portion was separating from the drip tip causing lack of seal, airy vapes, leaking tanks. Then her coils began dying in a day or two, vape through a tank full, unscrew the drip tip to refill, add juice, close it back up - boom, no vapor. Dead coil.
Rather than having a spare tank or drip tip hanging around 'just in case' it became necessary frequently cost of using the device. Ordering 4-5 drip tips at $1 each, the tanks at $7 a pop (adds up when you're buying 6-7 tanks at a time), 5pks of wicked coil heads at $12.50 a pop (burning out in a day or two made coil costs go from $12.50/mo to roughly $50/mo), then the ego batteries started getting weak ($13/each for 650mah ego's). Aside from juice, just the maintenance and upkeep to continue using a 'simple' product easily added up to $80-85/mo per person.
By contrast I picked up a $30 rta and a $3-4 spool of wire along with $7 worth of cotton and that single rta washed, rewicked etc between flavors lasted me over 5mo. Even factoring in a $30 mod with $12 worth of 18650's, a more complex set up was still cheaper than my monthly cost of operating a vape pen. Pretty sure their 'reactor' devices are just rebadged and higher priced isticks, they have all the matching 50w, 40w, pico etc.
The experience with these 'simple' devices may not apply to others like the juul, boulder rock etc. Chronic problems though coupled with an increasingly higher cost of operation takes the joy out of the 'simplicity' for me. They quickly seem to transform into a money pit.