My teacher last time got so frustrated when I couldn't keep time that she took out the metronome so I could play properly.
An old post, but was thinking about this recently. Some people, it seems, view the use of a metronome as some sort of penalty -- a sign that you're not ready for bigger challenges. But my best practice partner, who can play Telemann-Vivaldi rings at triple speed around me, is always one of the first to say, yeah, let's try that with metronome. Helps to solve a lot of (sometimes unexpected) problems and keeps you honest, so to speak.
And I like the tip about using a visual metronome. I find it sometimes difficult to hear the accented beat, so happy to have the visual indication (such as provided with the metronome built into MobileSheets).