Not being able to find any good reviews for this item, I took the plunge. This is the first FM transmitter that I have purchased for myself, though have previously bought one for someone else. Compared to the i-TRIP I though that this item worked better. It may be due to signal in the area, but I found that it worked well without any interference. Haven't travelled out of local area yet.
FM transmitters are renound for a slight hiss, but this is only really noticeable when nothing is playing. Not quite up to CD quality, but no FM radio is.
On the whole I am very happy with it. Worth noting the extractable cord which extends and retracts so you can choose the length to suit. Charging you phone helps too!