Hi TDND
I had used a Volcano Classic for years, then I wanted to try something for portability and I bought a Iolite. After the Volcano, the Iolite was a big disappointment... For me, the vapor was too hot, the butane did not last long, the taste was going too fast, and mostly large ignition problems that cause I stopped using it. Then, I bought a MFLB, but I have quite not used it because it did not suit my heavy use, even with 8 batteries.
Then I bought the Solo, and I must say I was impressed by the clouds of steam, the taste, and the battery is long enough.
To your question as concerts in public, no problems with the Solo. The stems cool quickly, and especially you can prepare several in advance.
Then, to be discreet, you can hide the Solo as some do:
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Phinéas