Okay, so I've been using this Milwaukee charger for about a month now, and here's the real deal:

First off - the dual voltage thing is LEGIT. Being able to charge both my M12 and M18 batteries without switching chargers? Game changer when I'm juggling multiple tools on a job site.

The fuel gauge is actually useful - no more guessing if my batteries are ready to go. Though I will say it charges the M18s noticeably slower than my old single-voltage charger did.

Build quality feels solid (as expected from Milwaukee), but mine arrived with some minor scuffs. Not a dealbreaker since it lives in my toolbox anyway.

Pro tip: Watch out for third-party sellers. Took forever to arrive and customer service was basically nonexistent. Next time I'll pay extra for faster shipping from an authorized dealer.

Final verdict? If you're deep in the Milwaukee ecosystem like me, this charger makes life easier. Just don't expect miracles on the charging speed front.