I was looking forward to this card since it was spoiled in Draft Packs. And now while it's here, I am even more excited. First, it is the card I was looking for my Kit - decoder early on, pretty much anything I want later, when CyCy hits. Also, bonkers with Nasir (as an emergency breaker on PW) and Schoolgirl (Sahasrara, Scheherazade, London Library, LLDS... Take your pick).
Now it is not the main breaker for me, the same way as the Sage never was. But it is a tool to fill the gap when you lack proper tools. It excerts the same pressure on a Corp, especially rushing early agenda/MMC and enables relatively safe facechecks (vide Cortex, Katana, Komainu, etc).. That makes Chameleon a great Killer/Fracter - both of which are in short supply in Shaper's toolkit.