People say smok have a lot of QC issues but I do propose this theory
Company A sells 10000 mods per month. They have 500 mods with faults.
Company B sells 1000 mods per month and 5000 tanks per month. They have 50 mods with faults.
By basic force of numbers, Company A has more mods with faults BUT has the higher quantity sold. This means that, whilst they have the same failure percentage, there's a lot more Company A mods with faults than Company B which means more disappointed customers for Company A. A disappointed customer will tell an average of 8 - 10 people about their poor experience. A positive experience will be relayed to approximately 3 people.
If you take into account the general negativity of the internet, we can assume that they are 8 x more likely to leave a bad review/post/comment etc than a positive experience customer.
Going back to the numbers, this means that, averaging 10 people per fault, 5000 people will here about bad experiences with Company A whereas just 500 will hear about Company B. Taking into account the internet, if a negative post is made and we assume an average traffic of 500 people per post (literally just pulling a figure from thin air here on the basis of it being a popular post) 2500 will hear about Company B compared to a massive 25,000 for Company A.
Customer service is a different kind of beast and not covered by my rough calculations.
Just bear this in mind when getting feedback on companies like smok.
Overall the odd work out but then SMOK doesn't actually provide any customer service. All companies have a few lemons but SMOK seems to have several. There is enough dissatisfaction out there with SMOK for me to steer clear of them.