The appearance is great as it softens and defines the fixture. Without the trim the (bright) white bulb gets lost in the white fixture on a white ceiling.
The trim connects via a platic ring that hooks both the bulb and the trim. The problem is that the ring tends to slide down the trim if it can't hook on the bulb. I eventually removed the ring from the trim, hooked it on the bulb, and then hooked the trim ring to accomplish the goal. It's a nit but I wish it were easier...