Well, unlike you I don't call a product "quality" just because mine works. More than a hundred thousand Ford Pinto's were on the road at one time, but that didn't make the Ford Pinto a quality product.
As for why I say it's cheap, poorly designed, and poorly assembled mess, it's because I've taken one apart and seen how it's built. I'm far from a novice when it comes to wiring and electronics, I'm a systems and network administrator by career now and I used to work in automotive electronics at an Infiniti dealership.
Allow me to show you why I say the SVD is bad.
Start by taking the battery out of your SVD and then look into the tube. You'll see a little black cap with a metal battery terminal in the middle.
Using a long, thin pair of pliers, pull that cap straight up and out of the tube. It's not held in with anything more than friction, so it comes out easily.
Just under the cap you'll find the first problem. I took this picture after having already repaired my SVD once, so you can see the thick taping I used as a wrap around the heat shrink I added when I repaired it. What you will find in yours is quite different. The positive battery wire is spliced together instead of being a single wire. The spliced wires are simply finger-twisted together and held in place by a tiny little piece of tape barely 3mm wide.
If you tug on the wire at all you'll find it easily separates since nothing is holding the connection together other than that one piece of tape.
This is a HUGE safety problem. If those wires come loose inside the tube and the positive battery wire comes into contact with the body it creates a very dangerous short. It would be like taking that wire and running it straight from the positive to the negative battery terminal and allowing the battery to discharge uncontrolled. I can tell you from personal experience that it's enough to heat the body of the SVD and get the battery hot enough to burn skin if you touch it. Left alone it could potentially cause the battery to catch fire or explode.
At the other end of the tube you'll find another design flaw. This o ring insulating the top electrical terminal comes apart really easily. Sometimes it's crushed or torn in assembly. When it tears it creates another short at the top of the SVD which must be repaired to make it work.
How to fix the Innokin, iTaste SVD E-Cig from the 5 second Red Button, 0.0 amp ground fault - YouTube
Then there are the problems with the micro tact switch that Mouth talked about. I had one of those switches fail as well, which renders the SVD totally useless and unrepairable.
I have never seen an electronics device as poorly built as the SVD. In my experience the wiring would be considered unacceptable, failing to meet the electronics industry standards that are found in common children's toys. It should be virtually indestructible, being nothing more than a metal tube with a tiny PCB mounted inside, but instead it is incredibly fragile and puts you at risk of extremely dangerous battery shorts and fires.
I would never rely on a twisted wire splice and tape for a low voltage speaker wire, much less a power wire that could cause a fire. It shouldn't be allowed to be sold the way it is.
