Yes I've used one for years now. It's fine for me, though keep in mind it's the only flash I'ved owned. TTL works fine, and any Olympus or Canon compatible flash cable gives you TTL while off camera, should you want it.
The downside is that it doesn't swivel. Pricier flashes do. So if you wanted it to keep the flash attached to the camera's hotshoe and bounce flash off ceilings and take photos in a portrait orientation, all at the same time, you can't with this one.