The reviews I watched weren't so glowing. So far as $20 not breaking the bank ... while that's true, I've been vaping for more than seven years and I've bought a whole LOT of inexpensive junk I found to be less than satisfactory. I've become a little less happy about $20 experiments and prefer to see what people who have had their hands on the device had for impressions. Many of them, such as pbusardo, have more experience than I'll ever have. But, they're 'reviews', not the word of gawd almighty. So, although you shouldn't take everything they say as gospel, it's better than blowing $20-30 on every gadget that sounds interesting at first glance.
I'd say someone with 100K+ subscribers has more credibility than some faceless, nameless, who'sit on a forum.