Certainly Yosemite seems much slicker on the three machines I've installed it on so far. It's older equipment so not been able to experiment with continuity/handoffs but then again I'm not replacing functional equipment to enable that.
Trying to decide what to do with iCloud Drive- possibly nothing apart from iOS backups. If I could access from Android I might consider using more than the free allocation but since google backs up all my phone photos FOC privately I'm loathed at present to spend money.