I've been using a magic box for around 6 months, after gifting my girlfriend with one. Also have an Arizer EQ Extreme. Anyway, purchased a VG stainless steel coil pipe.
The purchase was precisely for portability to take on a trip to Amsterdam. I used the pipe prior to the flight over and cleaned it well in iso-91. Then in Amsterdam repeated before the return trip, purchasing iso-96 in Etos. I purchased the lowest price but still quality vape I could find.
Anyway, the pipe made it through security with no problems. I kept the original package and on the way back a security person opened my suitcase and took a look but just put it back and didn't ask any questions.
For repeat trips to Amsterdam I will use this coil pipe again.
I do tend to carbon up the end of the pipe at times. This results in cleaning the end by rubbing with cloth or napkins. I've noticed the metal just gets shiny and becomes easier to clean as I wipe it slowly smooth.
Overall once past the learning curve of using a lighter I was able to get decent hits and get the dose faster than with the MFLB. I am satisfied with the vapor coming out and the efficiency.
Portability is fine. Didn't have many problems with anything leaking out through the coils. It's a well designed little piece of work. I kept it in both shirt and pants pockets and carried it everywhere.
Back home I find myself though reaching for the MFLB. Why?
1. Easier to stir.
2. Easier to load (I mean where do you sit the bowl on the coil pipe when loading? It won't stand on it's own, I found I could set it in the other half of the pipe while loading, but the intake sits on the carbon filter and it worries me it will slowly damage it.)
3. I tend to get more consistent hits with the MFLB, though it takes a little longer and requires more hits. This is partly because it's hard to see where the flame is at on the coil vape. My girlfriend took days to figure it out though I kept telling her exactly what to do ... she doesn't like to take my advice and prefers to do things her own way. Women!
4. For stealth they both do it in their own ways. The coil is stealthy but so is the box. However, while in Amsterdam, there are places where you just can't whip out a lighter and start vaping. However, with the MFLB there are very few places where I'd not do it. Anyway the MFLB wins in this also.
So for ease of use overall MFLB wins.
For quick vaping SSC is pretty good but MFLB is not far behind.
Hope this helps. Just my own little take on the coil vape (which I am happy with overall). As you can tell I like the MFLB a lot too, and the Arizer is also excellent just not portable.
I may be getting a stainless steel bat ... we'll see.