I love LED's. The only issues I have had, and I have installed over 50 now, is when replacing bulbs in enclosed fixtures and lights that are dimmed or controlled by a photocell. Some of the LED's make more heat than you may think and in a tightly enclosed fixture I have had a couple of older units that flickered. They clearly stated on their box "not for use in enclosed fixtures" but I had to try it. Darned instructions anyway!
Most LED's are clearly marked "Dimmable" or "Non-dimmable". Some of the non-dimmable units obviously can't be dimmed (yes, I tried that too) but they also may flicker when controlled by some types of photo-cells. I use LED's for outdoor lighting so I have to watch that.
Neither of these problems should be an issue in a garage and I agree with everyone, LED's are the ONLY way to go now the prices have come out of the stratosphere.