In fairness, the two florescent fixtures I placed these in were over 20 years old. The lights in one worked fine, except for the constant HUM! The other one only worked if you turned it on, and then got on a step ladder and twisted one of the bulbs off and back on.
The instructions from Sylvania are a little sparse, but this isn't rocket science. The single task that took the longest was finding the hex wrench size to unscrew the old ballasts. (Actually, you could leave them in the fixture physically, after disconnecting electrically.)
Otherwise, fast and easy. The product includes new end clips, recommended for the no connection end (being LEDs, they only need power at one end, not both, as there isn't an arc of harmful UV-B rays coursing down the center of the tube.), but they are mechanically and electrically compatible with the existing clips (provided they are wired correctly).
I had them both (two fixtures, with two bulbs) working within an hour of FexEx delivering them. Electrically, they are 10 watt tubes replacing a 20 watt tube, so the electrical savings might not look that great; however, they are much quieter and turn on much faster.
One caveat, the bulbs only glow out of one side of the bulb. The other half contains wiring. This isn't an issue for fixtures that the clips hang straight down, but one of my fixtures has the clips on a 45° angle. I don't consider this a problem in my situation, as the fixture is above a kitchen counter with a wall on the other side, and the wall doesn't need to be as bright as what I'm cooking. Your situation may vary somewhat, if so, you should check the fixture prior to opening your wallet.
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