I wasn’t expecting much from the Apple Watch Series 5 refresh. The rumor mill only predicted new ceramic and titanium finishes, plus maybe sleep tracking. That was all for this year.

But it turns out Apple had three big surprises hidden up its sleeves — new features that look set to make Apple Watch Series 5 the best smartwatch money can buy.

The Apple Watch has come a long way from the first model. With each update, Apple adds important missing ingredients, like GPS, a faster processor, cellular and an altimeter.

So has Apple Watch finally reached its true potential? Cupertino certainly thinks so. Apple COO Jeff Williams described Series 3 with cellular as “the ultimate expression of Apple Watch” at last week’s special event.

But three big problems still remain (not including the cellular connectivity glitch Apple is scrambling to fix ahead of this Friday’s ship date).