Yeah, boost button was a huge step up when I got my TS100 and now I can't imagine ever buying a new iron without it.

Plus, not having the ability to quickly tune temperature settings on the iron itself seems like a step back as well.

I'd be happy to be proven wrong on these, as iFixit's screwdriver sets were one of those things I needed to use to understand the hype (and then promptly bought my own set), so maybe this is another case of subtle quality you have to see for yourself?